[shultays]

We add some salt to most deserts as well, to make them more tasty (I am no expert so I don't actually know how it makes them "more tasty"). I highly doubt the salt in ice cream is for melting point, and probably it is also for taste reasons. OP is probably overthinking this

[ohwaitnvm]

You don't add the salt to the ice cream, you add it to the ice that surrounds the ice cream-making container.

[shultays]

Aha, sorry I should give it a proper read. Didn't notice it was talking about the ice

Also in the recipes I googled right now, salt is also an ingredient for icecream