This, I think, is a particularly telling summary of the connection between Christian doctrine and attitudes to work: "The underlying idea is that you’re endlessly undeserving – that reward, ie happiness, will always be contingent on the endurance of some unpleasant activity (eg “hard work”). Again, we could trace this notion to early moral ideas – eg original sin and redemption through suffering ..."
However I see two shortcomings in this essay. First, he doesn't make what should be the obvious economic connection. True, any job has value; this is evident from the fact that the employer pays for it to be done. There is a market in labor. However, the religion-derived morality that makes it deeply wrong not to work tends to drive down the price of labor. People will accept shittier jobs for lower wages than they would otherwise, when they also accept the belief that it is evil to be unemployed, and virtuous to have work regardless of the type or satisfaction of the work.
Thus the societal attitudes ably described in the essay serve the interests of the employers and work against the interests of the workers. If the workers didn't buy into this zeitgeist, they might not not-work, they might even work the same shitty jobs, but they would be more willing to drop them, and would demand higher pay in line with the shittyness. The necessary jobs would still get done (ya want fries with that); but the employers would have to pay more and provide better conditions because the workers would feel morally free to be more choosy about pay and conditions.
The second thing wrong with the essay is that it ends without even sketching a solution, or a direction that society might take if "antiwork" gained traction. It seems to be an empty term.