I disagree. You just don't accept the conclusion.
I don't accept the conclusion because as it stands the conclusion is just assumed.
You claim that Jesus not being omniscient would mean He is not God.
I'm not saying the conclusion is right or wrong.
I'm saying you are begging the question. You need to prove (or at least attempt to prove) the conclusion.
For example, here is a short list about God:
God is omniscient.
God is not man.
God is Spirit.
God is immutable.
God is omnipresent.
God is above all.
Off the top, we at least can say Jesus is man. He was "made a little lower than the angles". He became "flesh".
So just saying "God is____" therefore if Christ while on earth "wasn't______" then He wasn't God doesn't cut it.
Why would the Son not knowing the hour, and only the Father knowing the hour, mean that Jesus was not God?
Why would Christ not
being omniscient between His incarnation and resurrection make Him less than God?