i'll give you a hint: they're selling something
Then we're faced with "why would a (insert whatever makes this a preprint) mean they're not selling something"? (well, at least OP is faced with that, FWIW I think there's ~infinite snarky replies available, but they're sort of uninteresting, no? :)
Tbh I might be misrepresenting the original post, because in this case I did not read it, but for your point I feel like I also don't have to
you are gonna be so stunned to find out when more than one thing can be true at the same time
are they doing science? yes. are they selling something? yes.
After I entertain you by doing that, is there a steelman version of my reply you're interested in entertaining me with, by replying? Or, just the strawman?