Agree, but it's not a question of him appointing moderators. It's a question of people stepping up and volunteering to be moderators. There are literally thousands of kbin magazines which are currently abandoned, ie where the moderator of the magazine hasn't been active on kbin.social. Anyone can volunteer to take over ownership of these magazines by clicking a button, but there isn't enough interest in the userbase at the moment.
However, you are correct in that spammers are targeting the bigger magazines like m/fediverse, and because Ernest is owner of these magazines but is active on the site, these magazines don't appear in the abandoned magazines list. I agree that in order to ease the administrative burden on him, Ernest should call for additional moderators for these most active magazines, and even step down as the owner of these when one or more replacements have been found.