I dug deep in my stack of old optical discs in the attic and lucked out, finding my Apple 9.2.2 install CD from long ago. I was unable to find any online source of a 9.2.2 updater. Hopefully, Apple will eventually get around to fixing their broken link.
OTOH, if Apple chooses to no longer support Classic OS, at least they ought to make nice with their decades-long customers and allow third parties to freely re-distribute it. Ominously, the illustrious Apple leader once used a symbolic coffin to bury Apple's past. I hope Classic is not in that coffin.