Yeah after parsing the bits and pieces of the rvdata2 file that didn't come out as a garbled mess, it seems like it just describes what the skill is and the appropriate sprites to refer to it; not what it actually does. As for BasicAbomEatDed.json, I've been through that file many times and it doesn't seem to hint at how it activates the health restoration effect.
I'll just copy a similar effect and add it to the "effect" line right above "add_state". I think that method will simply restore satiety on cast instead of when a corpse is actually devoured, but it's the best I got. Assuming it actually works. If not, I got nothing.