IMHO all openSUSE/SUSE sites use the same accounts. Thus, no you are not required to create a new accoount. Use the same one as here.
When I allow all sorts of scripts from several Google sites that apparently are involved with this site, I do get the picture displayed. But I realy do not like it to allow third party sites to run scripts on my system. Particularly not if they are from Google.
But it’s obvious that a certain icon theme cannot look good with all possible color combinations.
That’s why they offer two official ones, Breeze and Breeze Dark.