It's a damn shame. Tombstone is one of the few current mods that I like the direction the changes have gone in over subsequent versions. As a casual player, I certainly don't appreciate being dragged into a dispute between devs, legitimate grievance or not. It is hard enough to troubleshoot a pack without having to worry about deliberate sabotage.
On that note I'd also like to complain about Twitch not separating Forge and Fabric mods. If these are going to remain incompatible paths, they should not be in the same update chain anymore than mod releases for different MC versions.