Think the main reason it doesn’t get talked about much is that impoverishing other countries was baked into the whole “America First” idea in the first place, including the [obviously incorrect] beliefs that trade is essentially zero sum so making these countries poorer is necessary to make Americans richer. But Trump also got votes from a lot of Americans whose main concern was rising prices, so it’s particularly salient that the first major effect of blanket tariff increase on consumer goods will be their cost of living going up...
(I think also the effects of US tariff levels on the typical <$2 a day person are relatively indirect: most of them aren’t involved in direct exports to the US from countries likely to be major tariff losers, especially if he turns out to be far more interested in restricting imports of Chinese manufactured alternatives to US luxury goods than cheap foodstuffs. Lower global economic output will slow their local economies down too, but that impact feels less tangible, and to an extent is balanced out by other factors like China’s increased interest in trading with the global South and whatever happens to energy prices.)
We do have an on record prediction from Yudkowsky, actually: in 1999 he predicted that drexler-style nanotech would arrive in 2010 (using some quite embarrassing reasoning, if I may comment as a physicist). He was also predicting that nanotech would “powerful enough to destroy the planet”, which is why he wanted to build the singularity himself, something he thought the singularity institute could accomplish by 2008.
This seems to be an instance of crying wolf by literally the exact same person that is crying wolf today.