I do find it humorous (in a pathetic way) that scientific atheists have wound up at this place.
OTOH, if the essential characteristic of God is that His will is equivalent to moral correctness, then a simulation creator doesn't necessarily fit the bill.
But then, if this creator of the simulator is there, can he (or whatever pronoun you wish) use something like a debugger to change things within the simulation? Behold, miracles now fit into the atheist view. Could this creator of the simulator send messages into the simulation? Now you've got at least the possibility of moral law given by the creator.
It's really mind-boggling to me that atheists are going down this path.
Okay, then define simulation in a falsifiable way, and we'll talk. The truth of the matter is, no one has defined this in a falsifiable way, so your statement is like saying 'religion is not buck-passing if you define God in a falsifiable way'. Without this falsifiable way you claim, it requires a belief in the transcendent.
The universe itself? It would be extremely weird, but modern physics is extremely weird.