Btw, it was like 15 pages ago, but everyone going through that list of "casesummer" email addresses, with comments like "holy crap this boomer was dumb enough to use the same email on a bunch of different sites"... few of those are likely to be him, if any.
It's not just one company selling phone cases or something, "casesummer" is also a more common phrase because of the "CASE Summer Institute"
which seems to be an organization that runs events around a bunch of universities, bringing together experts on human resources. I didn't look to see if this Polson guy has some background expertise in that area, but it would really make sense if he was explicitly trained to be a Karen by trade.
(I tried matching up some scholarly papers that referenced papers out of that institute and mentioned "Polson" but found nothing.)
Anyway, things that have "casesummer" are unlikely to all be him unless you have a reason to know otherwise.