Would Hel have kept her bargain with Thrym if he succeeded?

[Kardwill]

Presumably that they the unheard voices would get more of a vote in that particular moot. That's why he pledged himself to "getting our voices heard" but not "Destroy the world".

Yeah, I get the feeling it was supposed to be a "you neglected the demigods and almost had the world destroyed as a result. So it's time to pay attention to us, because there could be other swing votes in the future!"
Which quickly turned into "Oh ****! We really are going to destroy the world, aren't we?"