There is nothing baseless about these assertions. In fact these assertions even provide references to research they're based on. For example, it's pretty absurd to claim that this is somehow baseless

As returns to labour have stagnated and returns to capital have soared, much of the U.S. population has fallen behind. Inflation-adjusted wages for the median male worker in the fourth quarter of 2019 (prior to the infusion of economic support owing to the COVID-19 pandemic) were lower than in 1979; meanwhile, between 1978 and 2016, CEO incomes in the biggest companies rose from 30 times that of the average worker to 271 times. Economic insecurity is widespread in broad swaths of the country’s interior, while growth is increasingly concentrated in a dozen or so metropolitan centres.

Arguing that something isn't going to happened because it hasn't happened yet is a logical fallacy. It's like saying that you must be immortal because you haven't died yet.

I’ll take speculation about a right-wing coup or an economic meltdown seriously when we hit that point.

You're literally living through an economic meltdown as we speak. 20% of all dollars were printed during the pandemic. US inflation is going through the roof right now.

As somebody who lived through a collapse, I can definitively tell you that you're living through one right now. Whether you choose to accept reality or not is your choice. However, I guarantee you that reality will come barging in sooner than later.