Didn’t all the problems occur when COVID income supplements were canceled, and the private sector response to reduced demand was to raise prices to maintain profits?

UBI is orthogonal to increasing money supply, it's a single item in the budget among all others.

Single budget item vs many items is an irrelevant distinction, if the size of the single item, or the distribution (everybody), and intended use (to people for buying stuff) disproportionally affects the average-person's money supply and thus the market.

It wasn’t monetary supply to individuals, it was an unusually lower price of debt. This is not what we’re talking about here. Moreover, it’s lower cost of debt/money paired with a black swan one of a kind pandemic shock event.