The Banshee repos for 11.2 and 11.0 have been down for a couple of days here. Were their respective addresses changed recently or something? I can access 11.1 and Factory with no problem.
It looks like it’s been taken down
Look here:
Index of /repositories/Banshee
Why do you need it from there anyway, it should work fine from the OSS/Update repo ?!
Banshee is also here
Index of /distribution/11.2/repo/oss/suse
If they aren’t needed, why did/do they exist? 
As with other applications, I assume the latest versions are delivered more quickly through the specific repos than the general OSS one (if they are delivered there at all past a certain point). For example, on the OSS repo you just gave me, the version available is 1.5.1 while I’ve been using 1.7.4 from the Banshee repo.
I checked all the mirrors too and they are the same.
Guess you could ask in the IRC
#opensuse-buldservice
https://build.opensuse.org/