Yes, we have seen evidence: videos, pictures and other artifacts of the landing.

I think you don't know what evidence means. You want proof and that's for mathematics.

You don't know that you exist. You could be a simulation.

But isn't that the same kind of evidence that the deniers also seen? They also saw some images and videos and decided to conclude the other way around.

The fact that I know I exist is the only thing I know for sure. Whether I am simulation or a soul or whatever word you want to call it is irrelevant.