I tested the website and my repo on it and it works without any issues using LibreJS.
It specifies the different licences when making a new repo, including the different versions of the GNU GPL.
I'm unsure as to whether they say GNU/Linux, or Linux as it doesn't seem to be discussed on any of their websites.
There doesn't seem to be any odious conditions.
They use https for all their websites.
I hope this helps with discussing the criteria for this repo hosting website.