Renaissance artists didn't do much actual painting. They just sketched what they wanted, mixed colours, and had students do the rest. This is basically the same thing, only with abstract art. If this isn't art, then the renaissance didn't have any artists.
Andy Warhol had a Factory of people working for him too. Damien Hirst does now as well. It's not uncommon at all for artists to do residencies with big name artists. Have you ever had a gallery show? Let alone a whole museum at your disposal to do something with creatively - it's a ton of work, even for a group of people.
I'm agreeing with you though, this is art. Sometimes, so is my mom's cooking.
Exactly my point. Just because someone else is doing the work (or, in this case, something else) doesn't mean that the work isn't the first person's art. And yes, I suppose, anything can be technically art. But this is veritably the same kind of art we've already come to accept.