I downvoted the original comment because I thought it was factually accurate but misleading. The implication was that the amount of energy required made it obv

I downvoted the original comment because I thought it was factually accurate but misleading. The implication was that the amount of energy required made it obviously nonviable, but you didn't actually show the work to make that case. Without strong evidence, "go figure how viable this is" is an unhelpful thing to say when someone claims to have a working prototype. Your explanation here is much better (and I upvoted it), but I think it still misses the major point that the authors claim that the new device does not use a Peltier cooler. Instead, it's heated by the sun, and uses a passive heatsink. I think it's the same mentioned in the earlier paper as "We also report a device based on this MOF that can harvest and deliver water (2.8 L kg–1 day–1 at 20% RH) under a non-concentrated solar flux below 1 sun (1 kW m–2), requiring no additional power input for producing water at ambient temperature outdoors.". So I think the answer to your question is "Yes, it can be viable if you have a convenient source of heat that can produce the necessary energy". 1 MJ is about 270 Watt Hours, sunlight at noon is about 1000 W/m^2, and solar thermal collection can be more than 50% efficient. This doesn't mean it's viable, but as the new paper shows, if you have a square meter of sunlight available the energy necessary for condensation is probably less of a limiting factor than the collection of the moisture into the (currently exotic) sorbent.