It's unfortunate for anyone touting zeros as actual physical entities
Who's doing that? The question was "do zeros exist?" I answered it. There are zero zebras in the room in which I am typing this. Zeros exist.
Thinking about it: this room is a physical entity and contains zero zebras, so there we are: a physical demonstration of zero.
and then in the hope that establishing that a real physical entity called a zero suggests that actual infinities exist.
I've demonstrated that physical zeros exist. It was you who claimed that zeros existing means infinities exist, not me.
Although, I will point out that the physical universe appears to be infinite in extent, according to the latest measurements. So there's that.