we're aware of this and have been in contact with the mod before, asking them to let us know if this ends up leading to moderation issues.
some people behave strangely, but as long as they're behaving well we're fine with tolerating that.
i haven't been monitoring their accounts in detail, but they have been doing this for months already.
if they're causing issues we will look at options for enforcing this, although with federation being a thing they'll likely just move on to another instance where we will be less able to control this and continue from there. just posting content that is on topic and using new accounts frequently is not necessarily what we consider a problem, but if this links up with bad behavior in comment sections that is a different topic, as the account deletions effectively make moderation impossible. at that point however it will become a topic of interest for us, as we don't like seeing ban-evasion or evasion of other moderation actions.
if you happen to see them causing more issues please make sure to report the comments in question, as this will persist the contents at the time in our database, and also let us know directly e.g. via pm to @[email protected], as we won't typically see community reports when not actively looking for them.