AFAIK those are antix/mx and devuan based distros and forks.
If they have been running testing, since debian 10 buster became stable today, those testing debian will be on bullseye repository. Since this is an all new repository don't expect antix/devuan testing to be fully compatible with it. So it is best till antix and devuan announce their own next repository, to remain with debian/buster and antix/devuan testing.
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