When I look at the urlmake_clickable_callback(MAGIC_URL_FULL, ' ', 'http://tardis.tiny-vps.com/aarm/', '', ' class="postlink"') I see two directories:
packages/
repo/
There is a tool in AURs called "downgrade". This is a very useful tool to roll back packages. "downgrade" uses packages/ subdirectory
I noticed that when I rol back wpa_supplicant I get only offered very old versions. By looking at the urls with a browser I see that in repo/ subdirectory there are more packages for wpa_supplicant than in packages/ subdirectory. Also it seems that in both directories there are real files, no symlinks. packages/ and repo/ differ so the tool "downgrade" does not offer all possibilities. It would be nice if both subdirectories carry identical versions. Maybe an automated process which symlinks packages from packages/ to repo/ would be the solution?