God is a triune being.
Father, Son, Holy Spirit.
You base your opinion and theology of God’s knowledge on scriptures concerning Christ’s knowledge outside of unity with The Father within the God-Head.
You seem to overlook the scriptures referring to knowledge that the Father has which He has in addition to that knowledge the Son has.
That being the case (God) still knows it and contains the knowledge.
That is like saying a car can’t blow a horn as you look at it’s tire.
No the tire can’t blow the horn because it is a part of the car.
But the car as a whole using the steering wheel can blow the horn.
I suggest that you enlarge your concept of God as a whole and triune being and not concentrate so much on the individual essence outside of the God-Head.