I’ve addressed the point. God doesn’t need to be us at the same time to know what it’s like to be us. Knowing what it’s like to be X is not the same as being X. Besides, we already established that we are a part of God, so God being self-aware, entails that God has full knowledge of us. In any case, I will try and further address your point.
Your sentence of “Everyone else can precisely know what it’s like to not be god” amounts to everyone knows precisely what it’s like to not be infinite. We understand omnipresence and infinity sufficiently, but we have no idea what it’s like to be infinite or omnipresent. It’s an unknown. Do you agree with this?
We clearly don’t have the potency or sufficiency to fully know what being omnipresent/infinite includes. Do you agree with this?
We don’t have the capacity. It’s logically absurd. On the other hand, the reverse does not encounter the same problem. The infinite/omnipresent clearly has the capacity to fully understand a finite or even semi-finite entity that it fully sustains. Do you agree with this? If not, why not? How can that which is infinite of which we are a part of, not fully understand what it’s like to be us?
Simply put, that which is infinite and omnipresent contains within it all the tools/senses/sentience potency and whatever else is necessary to fully understand an infinite amount of information. We will never have such an ability because we can never tap into infinity. But that which is infinite sustains the finite. It knows fully all that is knowable about the finite entity that it sustains.