I agree Hades is not paradise, never said it was. I agree that Jesus went to Hades when he died, but what I don't agree with is that Jesus preached to these spirits in prison while he was in Hades. So I disagree when you say, "When Jesus died his human soul went into Hades and preached to the spirits in Prison (1 Pet. 3:18-22)."
Jesus was dead for parts of three days when he was in Hades. So I disagree that he preached to those spirits while he was dead in Hades for parts of three days. Dead means you can't think, speak, hear, see, etc.
What I believe 1 Peter 3:18 -22 is teaching when it says, "he was put to death in the flesh" it means Jesus was put to death as a human being, and so his human body was sacrificed, and when it says, "but was made alive in the spirit," this is talking about when Jesus is resurrected, as a life giving spirit who was given immortality and inherited incorruption. It was in this state, as a life giving spirit who has immortality and incorruption that Jesus preached to the spirits in prison. But Jesus had been resurrected out of Hades so when he preached to the spirits in prison he wasn't in Hades.
18 For Christ also suffered once for sins, the just for the unjust, that He might bring us to God, being put to death in the flesh
but made alive by the Spirit,
19 by whom also He went and preached to the spirits in prison,
20
who formerly were disobedient (544 ἀπειθέω apeitheo), when once the Divine longsuffering waited in the days of Noah, while the ark was being prepared, in which a few, that is, eight souls, were saved through water.
21 There is also an antitype which now saves us-- baptism (not the removal of the filth of the flesh, but the answer of a good conscience toward God), through the resurrection of Jesus Christ,
22 who has gone into heaven and is at the right hand of God, angels and authorities and powers having been made subject to Him. (1 Pet. 3:20-4:1 NKJ)
"Made alive by the Spirit" refers to Jesus' human soul being quickened with life because at death the human spirit animating the soul "returns to God", so it had to be replaced so Jesus wouldn't be a shade like all the human dead.
Once quickened, enveloped in the Holy Spirit, he went and preached to the spirits in prison since the days of Noah, who couldn't believe Noah's preaching God would forgive them, because they were the dead spirits of the "men of renown" hybrid angel human spirits.
But they responded to Christ's preaching with the answer of a good conscience just like the church does, so Peter saw this event as the antitype of Baptism, Christians are buried with Christ and then rise with Him as new creatures:
4 Therefore we were buried with Him through baptism into death, that just as Christ was raised from the dead by the glory of the Father, even so we also should walk in newness of life.
5 For if we have been united together in the likeness of His death, certainly we also shall be in the likeness of His resurrection,
(Rom. 6:4-5 NKJ)
12 buried with Him in baptism, in which you also were raised with Him through faith in the working of God, who raised Him from the dead.
13 And you, being dead in your trespasses and the uncircumcision of your flesh, He has made alive together with Him, having forgiven you all trespasses, (Col. 2:12-13 NKJ)
Then, after they repented and believed His preaching Christ ascended from the depths of the earth with these former captives in His train, bringing them to third heaven with all the other Christian dead.
They were a special case, so Christ made a special trip to them. Their refusal to believe God would forgive their mixed angel-human DNA was reasonable. In the LAW we read:
`You shall keep My statutes. You shall not let your livestock breed with another kind. You shall not sow your field with mixed seed. Nor shall a garment of mixed linen and wool come upon you. (Lev. 19:19 NKJ)
So they wanted to believe, but knowing God (no doubt from their angel fathers the sons of God Gen. 6:2), they were "disobedient" because they were "disbelieving". They were formerly disbelieving but now believed Christ and gave the answer of a good conscience towards God just like the Church does to Christ's preaching:
544 ἀπειθέω apeitheo {ap-i-theh'-o}
Meaning: 1) not to allow one's self to be persuaded 1a) to refuse or withhold belief 1b) to refuse belief and obedience 2) not to comply with
20 who formerly were disobedient (544 ἀπειθέω apeitheo), when once the Divine longsuffering waited in the days of Noah, while the ark was being prepared, in which a few, that is, eight souls, were saved through water.
21 There is also an antitype which now saves us-- baptism (not the removal of the filth of the flesh, but the answer of a good conscience toward God), through the resurrection of Jesus Christ,
Therefore, this text totally refutes your theory Christ didn't preach in Hades.