I was just in Talladega earlier today. AL 77, and perhaps AL 21, appear to have been rerouted through the city.
I followed the signage for AL 77. Approaching from the south, I took Haynes Street to North Street East then turned east (rather than to East Battle Street then turn west, as the HB now has it). From North Street East, I turned left onto the Western Bypass, then north on AL 77 at the intersection shown on Google Maps with East Street North (the road north of the Western Bypass has no name in GM, OSM, or other maps I've looked at).
AL 21 appears to have been rerouted as well, onto the Western Bypass. But I am less certain about this. I am more certain that AL 275, at least on the part of the Western Bypass I traveled, is no longer signed (at least westbound) and is probably toast.
I'm now just east of the Mississippi state line, heading west, with no plans to return home via Alabama.