Why on Earth would they?

That question sprung to mind too, right before "How could that even make sense?" and a few hundred milliseconds later "What are the precise engineering details required for me to use this effect (and the implied possibility for FTL communication) to go back and sink the first fleet, thereby preventing my own existence?".

Edit: Also that paper does not say anything about cosmological horizons converting anything into Hawking radiation! It's an entirely different and stranger argument.

(My reply is to the version conveyed within the grandparent, not to the strange argument. It is probably best for me to hold off reading said strange argument until is confirmed as reasonable by a sufficiently trusted source. Given the complexity of the subject I may forget to not-believe something I read.)