I have set tick speeds to high rates and tested multiple times on both multiplayer and singleplayer and totem of radiance doesn't damage hostile mobs at all

This will be fixed in the next update.
I've had a lot of personal business due to uni lately, but now I have time to release a new version including this fix soon :). Please be patient

Fix/ Feature is now out in BetterArcheology 1.2.0!

This issue will be closed. If the problem still persists or similar, feel free to reopen this issue.

Links

Please wait until CurseForge has verified the files and wait for the 1.2.0 :)