But someone must be outside the simulation because someone created it.

Sorta, but not really. It is because of our human, linear minds that we think it must be so.

When people ask is God outside, or inside... and the answer comes back as "Yes".

we are the universe's way to experience itself and know itself.

That is true in one respect, but it depends how you define the universe.
I would define the universe as an operating system. It is a construct that does specific tasks.
Like when you perform an action, it does an equal and opposite reaction.

But there are other aspects that one might lump into "the universe" and those are definitely involved in the whole game of knowing itself. Seeing what will happen.