https://steamcommunity.com/sharedfiles/filedetails/?id=1897946622
Finally got the beginning of the FNaF 2 part 1 pack up and running, currently has Toy Bonnie

So, I contacted Steam Support and got a reply that they made a mistake in evaluation, so now the addon is back up for all of you. It is the same addon, not a reupload; you do not have to re-subscribe (I believe, anyway.)
Have a good day!

This is not my doing, it is Steam's doing and I currently have no idea why it has been removed and I am contacting Steam for more information. If I end up never having information about it, I will simply just remake it (with my new skills too) and I will try to make it not "break rules" as my other one apparently did.
Sorry for the inconvenience.