I am also leaning towards this reason. A number of mods have left or become inactive and there gotten a disqualification but I don't remember the admin ever giving other user the moderation responsibility in the past 2-3 years
If you noticed then you should have seen hilariousandco used to response concerning any forum related issues from the users but I do not see him to address on this thread yet. The last one I remember to get mods job was Welsh and it's been a long year since then. So it's pretty much a certain that we have not enough mods right now. I have seen many users to talk about not banning users for plagiarism even after reporting the plagiarist. This is not good at all for the forum after all.