The NHS study cited in the post is pretty strong evidence that precarity can increase support for proto-fascist politics.
But that rationale falls flat in the US context, as many analyses show that the median income of MAGA supporters is quite high. Right-wing extremism in the US isn't really about revolting peasants, it's about an alliance among multiple groups up and down the security-precarity spectrum, with very strong support from the top 5% and even more support from the top 0.1%.
Just because precarity can be a causal factor doesn't mean it's the only factor or even the dominant factor in the US.
And I wouldn't be surprised to see the US regime move into full money-printer stimulus mode to finance its wars of choice and give its base a little financially security before this year's midterm elections.
And it's coming from a starting point in which MAGA already distrusts government, so there's no need to have an external factor involved. It's quite odd looking in from another country where the government may not necessarily be too competent but generally tries to do the right thing and most people are looked after even if they grumble a bit, to the US where the government could cure cancer and half the population would say its a conspiracy by George Soros or Bill Gates or Big Pharma or the lizard people and would want nothing to do with it.