I agree, sort of.Purgatory is not extra Biblical.
There is purgation for the "undetermined" ("Middle People"), people who go to hell without Christ. The gospel is preached to them in Hades, but they will pay for sin and be purged of all that diminishes their ability to accept the Gospel of Christ preached to them, to enable them to choose to live according to God in the Spirit:
For this reason the gospel was preached also to those who are dead, that they might be judged according to men in the flesh, but live according to God in the spirit. (1 Pet. 4:6 NKJ)
There is no purgatory for believers, who have passed from death into life: they go immediately into the presence of the LORD upon death of the body, saved to the uttermost, just like the Thief on the Cross:
"Most assuredly, I say to you, he who hears My word and believes in Him who sent Me has everlasting life, and shall not come into judgment, but has passed from death into life. (Jn. 5:24 NKJ)
We are confident, yes, well pleased rather to be absent from the body and to be present with the Lord. (2 Cor. 5:8 NKJ)
Therefore He is also able to save to the uttermost those who come to God through Him, since He always lives to make intercession for them. (Heb. 7:25 NKJ)
And Jesus said to him, "Assuredly, I say to you, today you will be with Me in Paradise." (Lk. 23:43 NKJ)