God said "This is my beloved Son in whom I am well pleased." Matthew 3:16-17 "Or Thou art my beloved Son in whom I am well pleased." Mk 1:11, 3:22.
The sense is the same. That testimony given by the Father was for the benefit of those who heard it. Christ didn't need to know he was God's Son because he Himself is God.
Also Christ didn't need to be baptized because he had no sin there would have been no emotional feeling of being freed from anything. Any way John's baptism didn't make you born again that came only through the baptism instituted by Christ which included the Spirit:
Acts: 19:2 And he said to them: Have you received the Holy Ghost since you believed? But they said to him: We have not so much as heard whether there be a Holy Ghost. 3 And he said: In what then were you baptized? Who said: In John's baptism. 4 Then Paul said: John baptized the people with the baptism of penance saying: That they should believe in him, who was to come after him, that is to say, in Jesus. 5 Having heard these things, they were baptized in the name of the Lord Jesus. 6 And when Paul had imposed his hands on them, the Holy Ghost came upon them.
Nothing in that post negates the experience part of baptism. I’m not sure what you are trying to say here.