Was it some kinda mass dmca sorta thingo, cause im not sure if there was more posts with the copyright tag before deletion of the pool?

The pool was deleted but the posts were left untouched. Pools are not meant for what that pool was being used for. The images were not related to each other in any way beyond being part of same setting. That is what the copyright tag is for. And yes, all of the posts can be found under the copyright tag.