TBH, while I'm not against listing Hakai as existence erasure and giving goku and frieza some minor resistance to it (given that it wasn't a proper hakai, just a third of the destruction energy Sidra gave to the guy), so far it seems like it is more like body&soul destruction, given Sidra's especifically pointing how the energy would make it so that the target would not go the the Other World and how it seems to work in the manga.
In the manga, Beerus and Goku's Hakai reduces the target to a pile of dust, which is just like Beerus destroyed a egg that one time; and Beerus and Champa's short fight was affecting the room they were in, giving more credibility to those instances being caused by this "destruction energy" and Hakai being a technique using this type of energy. Goku's Hakai also only partially affects Fusion Zamasu, destroying half of his body, and Zamasu easily regens that. I have to believe having your existence even partially destroyed would have more consequences than that. It honestly looks like it's just some kind of Durability Negation technique that destroys body and soul.