The chat in the screenshots make it pretty obvious that EggoWaffle & Yoloswaggins both were working together to get the catapault built.
-Yoloswaggins thanking Eggo for the help
-Eggo saying "they had to be sneaky"
-Eggo saying how many more trips to get mats would be needed
-Eggo saying he "has 4" materials
-FARTLORD_PISS asking eggo where they were building it
-Eggo saying 'TE HE' and cheering along with yoloswaggins right before people crash
Even if the "worst he did" was guard yolo as he built the catapault, he's still obviously colluding/encouraging/protecting the building of an object he knew shouldn't be built and was explicitly told not to build.
Maybe if more evidence comes up I'll take a look at it, but right now it seems pretty cut & dry.