I don’t think that is the case as the “Son” is not confined to Jesus’ human existence. The trinity is the father, son and holy spirit, right? Jesus was stating this as an example of something the father knows that the son does not know.
Just commenting and not trying to argue either. After all none of us fully understand all of these things. It is a mystery. :-)
>> “The trinity is the father, son and holy spirit, right?” <<
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Except that the ‘trinity’ is a human construct, and is nowhere to be called out in scripture.