You seem appropriately skeptical for my purposes. Free answer time my man. What's your take on a major national lab investing big money into technology based on physics that is 100% wrong, according to what is publicly known? https://arxiv.org/pdf/2306.06133.pdf (please note equation 15).
That Grusch guy says there is, and he's as honest as the day is long, according to other people, none of whom are willing to present hard evidence to corroborate his claims. Scout's honor, though.