This might be bad in its own way, but I saw that the screenshots were 100% macOS and immediately assumed that it was Mac only and closed the tab. I actually had to go back and look because I could have sworn that I saw it written somewhere, but no, it was just the screenshots and the general feel of the text that clued me in.

I think part of it is that apps that are designed to be multi-platform don't tend to use macOS screenshots because maxOS is a minority of their users.