I'm curious how you came to the conclusion that the editor(s) were/was trying to hide from Jimbo. Despite what Fred said, I'd be very surprised if no one ran checkuser, after all, it can be run without generating a public log...
A public log, no, but there is still a log viewable by other checkusers, and they all have a responsibility to monitor that log. If anyone runs a checkuser without good reason (and there is no good reason here), they won't stay a checkuser for long. The tool isn't there to satisfy idle curiosity.