It saves money in air compressor energy costs, but the article glosses over how long this takes compared to traditional methods. If it takes 10 times as long to paint a car this way then you have to replicate it 10 times in the factory to maintain the same rate of production which could very easily end up costing more.

On the other hand, masking is a pain in the ass and takes a lot of time so this could end up being faster all around so long as you're comparing with complex multi-tone paintjobs.