Apparently, we were panicking all for nothing, it was just a prank by some 4chan trolls. The source code for TF2 and CSGO were a few years old and it won't work on current builds.
I'm so sorry everyone for non-member users, I know I'm supposed to add Gmod pictures to this group but I forgot that I was an admin in this group cause I've been kinda very busy for the past few months.