Oh wow, you appear to have nailed it. In a regular window I see

which even looks partially updated for 2019! Except for there being no "request an invite" links, and the FAQ link at the top there going to the 2018 FAQ.
When I open the site in Incognito, I see

which appears all good.
Great catch! Maybe there's still feedback for the organizers there, to try to bust users' caches or something
Separately, hoping to hear your extension talk and others at the summit!