ye I guess sorry for the terrible english i will try to review again with my terrible english
overall it looks like an incomplete plugin for me, there's just too much "incomplete" modules in the plugin like /vanish /antimobtarget. Moreover, the /god just works like the way how essentialsx handle it, it doesn't even try to spoof creative or something else to prevent entity from targeting you.
But ye as you said invulnerability it does makes sense. And it shouldn't be a part of /god, but anyways what's the point of /antimobtarget if it "(doesn't even try to spoof creative or something else to prevent entity from targeting you. )"
i will review again soon once my english gets better
suggestion for the /antimobtarget, try
https://www.spigotmc.org/threads/make-custommob-stop-attacking-following-player-on-condition.479146/
event.setTarget(null);