Per T158315#3038283 (removal of semi-randomly chosen people from sysop group). He clearly has a use for it: https://wikitech.wikimedia.org/w/index.php?title=MediaWiki:Sitenotice&diff=prev&oldid=882061 .

The easiest way is probably to add him back to the sysop group, but there might be better solutions, including adding the editinterface right to the contentadmin user group ;-). I propose that we think of bigger changes once the rationale of the current setup is written down, to have a better starting point.