Moderators are elected to moderate the community, not to actively post.
It's not uncommon for a moderator's Q&A activity to go down and taper off entirely. As long as the moderators are monitoring the site and handling situations that pop up appropriately, they are doing the job they were elected to do.
The moderation team has the situation well in hand.
You've all heard it before and may be tired of hearing it, but that doesn't make it any less true or relevant: a lot of what mods do is not easily visible to the community. Everyone can see edits. Everyone can see when a mod closes a post—though that is and should be fairly rare; except in the most obvious cases that's left for the community to decide. 10ks can see when a mod deletes a post if they happen across it, unless it was spam-nuked—there's no way for non-mods to see whether a mod or the community did that. Non-mods can't tell who deleted comments or who saw, acted on, and/or dismissed flags.
And to address concerns about handling time, we're at an average of well under two hours, and that includes sitting on borderline NAA/VLQ flags waiting for them to go through the queue to see the community's reaction. That's well under the all-time average and compares pretty favorably to other sites.
Some data to support this
In light of the concerns raised by the community that not all the moderators are active enough to handle the workload, we asked the CMs to provide us with some data to compare ourselves against other sites on the network and track our own performance over time. We've been instructed not to publish details, but we can provide some basic statistics.
Among all ~170 sites on the SE network:
- We are ranked #23 for lowest average flag handling time, and that time is less than 2 hours.
- We are ranked #77 for lowest median flag handling time, and that time is less than 30 minutes.
We also obtained data regarding our median flag handling time from month to month over several years. That time has been stable since early 2016 (the last moderator election) and is the lowest it has been in the history of the site. The median flag handing time was slightly higher in 2015 (after the penultimate moderator election) but comparable.
Moderators are removed by SE staff in consultation with the other moderators, not by a vote on meta.
And it has nothing to do with posting or comment frequency.
In short
We're reluctant to remove a moderator without clear and compelling evidence that doing so would be more beneficial to their community than their presence as a moderator, and we understand and respect that people have lives.
The community team takes into account the community's view and complaints, of course, but "they're not posting enough answers" is unlikely to be taken seriously.
Removing a diamond for inactivity takes a long period of time. What I've heard is about six months without visiting and a year without taking mod action, and the community team will try to contact and discuss the situation with the mod in question.
In conclusion
- At least two mods are more active than you are suggesting.
- The moderation team is in no way overworked.
- Not posting enough is not going to get a moderator removed.
If the community's biggest complaint about the moderation team is that they're not posting enough, that's way better than most sites.