This abundance "movement" has absolutely nothing new to offer, it is simply a rebranding of neoliberalism. It's easy to spot too, just look at who backs the movement: the same old establishment democrats and their wealthy donors. The same people who have entranched the democratic party into this technocratic blob of ineffectiveness and societal erosion. In particular, it is financially backed by, among others, Peter Thiel and Mark Andreessen. This should raise some red flags.
Also, I personally like winning. This abundance movement has exactly zero electoral hype. American voters don't care about it at all. Meanwhile, populist leftists like Mamdani are able to generate momentum for the left for the first time in decades. That Klein, Thompson and the billionaires behind them are so harshly criticizing them should raise additional red flags.