The verse in Psalm 30 does not assert the Son of God, as it is merely a question that Solomon is asking. As I have said many times, where in the OT do we have the Son of God mentioned, or doing anything? If He was in the OT, then why is He silent, whereas the Holy Spirit is active?
After His Resurrection, Jesus' Body was not the same, prior to the Resurrection. We read, for example in
Luke 24:31
"Then their eyes were opened and they knew Him; and He vanished from their sight"
And,
John 20:19, it says
"On the evening of that day, the first day of the week, the doors being locked where the disciples were for fear of the Jews, Jesus came and stood among them and said to them, “Peace be with you.”"
and verse 26
"Eight days later, his disciples were inside again, and Thomas was with them. Although the doors were locked, Jesus came and stood among them and said, “Peace be with you.”
In the former instance, Jesus simply "vanished" while speaking to the two men. In the latter, the doors were locked, and Jesus "stepped into the midst”, suddenly appeared among them.
There is no record in the Four Gospels, where Jesus did this at any time before His Resurrection.