I just tried to login using my current (newly updated) password - rejected. Logged in with my old password, so it's not a matter of permissions. I assume the databases aren't synced up, or something. So there's that..
I tried this and you are correct. Login to the Trail Wiki is still possible but only using old (not current) passwords, probably dating to VS buying ClubTread from Jim. That's a potential security issue right there.