So, I made an update to this mod that works with 2.1, and fixes a few things, as well as adds the ability to pin the location of the damage and a couple other little details.
https://mods.factorio.com/mod/updated_combat-log
If this is useful for anyone, I hope it helps! And to the original author: Let me know if this is okay, or if you want to put these in this original mod or something. I just did this to be helpful!
Cheers,
~Agnapot