I appreciate your reply.God is the perfect Teacher, so it might be a lesson He is teaching us here, to "check things out, and not believe what others say blindly".
No, that is not what it says in the verse you gave. He does not claim here "I don't know", He just says:
"I will go down to see if their actions fully justify the outcry that has reached me. If not, I will find out"
But this does not imply, that He MUST go down, otherwise He won't know. That is just your interpretation.
I met a Master who loved to pretend to be ignorant. Only once I read in His books that He warned us that if God comes down to earth, He might act like normal people act, but don't let this fool you, thinking He does not know everything. This might apply here. The words are chosen very smart.
Keep in mind, though, I used more than one Scripture.
(And there are others I didn’t use.)
All must be taken into consideration, to reach an accurate conclusion.
Have a good day, my cousin!