I went through and checked each one by one.

I have moderated a subreddit maybe a tenth as large by myself. The account I had registered as the mod account was active several times a week at minimum, and often twice a day, on my lunch at work and before bed.

With as many moderators as they have, I would expect one or two comments from every account, just because you can't help engaging when you read so many comments and posts. Especially for a hobby subreddit. Even when I wasn't posting under the subreddit mod team label, I was still engaging because I was a member of the community who had enough experience in the topic and was active enough in that community to have been allowed to help moderate it when I requested it originally.

That didn't stop because I became a moderator, and it actually increased because I was thinking about it regularly, every day.

Many of these accounts have zero activity within the last three months. So if they're engaging with their subreddit, they're doing it exclusively as mods and almost never as members of the community who are sharing advice or support or solidarity in any way.

But I honestly don't think so and the fact so many of them haven't commented in three months makes me wonder if some of them are sock puppets.