Federation isn't disabled directly. The admin put the instance behind a cloudflare proxy, which breaks the ActivityPub federation without further tweaking to open up the relevant ports. He's working on loosening up that restriction to get federation working properly again.
Edit: Also kbin.social currently sits at ~126k users.
I feel called out lmao. I've been more active on fediverse apps in the last week than I was on normal social networks in the last year.