but does it actually fully support the PSD format or is it false advertising?

This day in age, we need to verify ourselves

Can you show us an example? How did you verify?

These Github repositories contain copies of my JS files (identical JS - letter by letter), with a few lines deleted to allow running it on any domain.

I wanted to discuss the behaviour of Github without giving these "projects" even more attention.

The website is public, you can verify yourself.