[dekhn]

Freezing (properly) is widely considered (by scientific establishment) to kill most parasites, not just slow them down.

[mapt]

When biologists talk about parasites, they're talking about numerous organisms from multiple kingdoms in one of the widest ecological niches.

When the FDA talks about freezing killing parasites in fish, they're talking specifically about anisakis worms - https://en.wikipedia.org/wiki/Anisakis