Before bashing BikeForums and dissing the mods, see the following:
https://www.bikeforums.net/forum-sug...orums-1233970/
The mods and admins are aware of the issue (no, this is not intentional - note that desktop breadcrumbs are broken as they reference the old links) and they've started a ticket with the back end developers who will have to find out why the permalink structure got broken.
Have patience.
-Kurt