According to the Tumblr of Galaxy does BL, they are asking for people to stop reposting their scanalations on social media. Since scanalation is illegal and this puts them in the public eye, this is not good for the group. It seems that as a precaution, they are only releasing scans on their group site. I don't know why they aren't really posting on mangadex.
Group page is here: https://mangadex.org/group/8874/galaxy-does-bl