>> “Are you also contending that Jesus sinned?” <<
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You do love a strawman argument, don’t you!
We all know that David’s words in confession serve to reinforce the validity of his prophecy.
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So you say Psalm 69:5 does not count but Psalm 69:8 does. It’s not consistent but if it makes you feel better, okay.
5 You, God, know my folly;
my guilt is not hidden from you. <==== Doesn’t count.
8 I am a foreigner to my own family, a stranger to my own mother’s children;<-—— Does count.
You really can’t explain it.