Had no idea these things existed

This is actually making me wonder if they didn't up the saturation of the pic a great deal to make them seem redder than they are. These do seem to be a real banana, but most of the other pics I see of them they're are much duller, more purple than bright red

You are correct. Real red banannas aren't thay red. The above pics are fake.
https://en.m.wikipedia.org/wiki/Red_banana