Microsoft does appear to have blacklisted kesug.com entirely:
I’ve reported it as a false positive, and they have an option in the same page where the website owner can contact them as well, but I’m not sure if that would be helpful (or even needed, as I hope they’ll process my report and remove it).
On the bright side, visiting http://classof69.kesug.com/index.html gave me no errors, so it seems like your issue may have been fixed @wiclee.
As @YT_Xaos reports, this may not be the case after all. We’re on the same Edge version, so I’m unsure as to why we have a different experience, but as it has been reported as a false positive, it will hopefully be resolved soon.