This isn't based off any study at all, just my guess.
I will shorten neurotypical to "NT" and neurodivergent to "ND".
Art is very old, and human history has been very closely tied to art. Cave paintings and ancient music was one of the best tools for us to bond and relate to each other, it's a "human experience" (something many NDs especially yearn for, feeling as alienated as they are), and an easy method for expression, as well as a source for catharsis. It is something very tried and true.
I think it's a simple yet fundamental thing our brains are wired to turn to when placed under similar circumstances / stresses. I don't think it was a coincidence that when COVID struck and lockdowns were put into place, a lot of people took up pet projects in baking or painting or pottery or whatever it is. There's a parallel there- when people lost their jobs, were confined to their homes and the same people, the same faces (which a lot of NDs, especially ones who are less independent, also experience), a good number of them turned to art (or some other form of creativity/creation) to stay sane and maintain their mental, spiritual, emotional health.
There is also something great about being able to create and find meaning that the brain craves, and art is a great medium for that- when they lack the 'typical' modern outlets in the form of jobs and social accomplishments, art can be an excellent stand-in. People need something to do to feel fulfilled and art is something you can do on your own time, pace, schedule, etc- something that can be very mentally helpful to an individual who is already struggling a lot with regulating and keeping up other areas of their lives- being able to look at something and have a sense of "I did that. I made that."
That being said, I think it's not necessarily strictly tied to / coming from NDs being ND, but rather the (at times, frankly oppressive) circumstances NDs often find themselves in due to the lack of accessibility society affords them. I'd side-eyed several 'telltale diagnostic criteria' of certain disorders because people were talking about it as if it was a result of the disorder rather than a result of the mismanagement of it- yet pointing at the symptom as a determinant, as THE determinant that decides whether or not you have the disorder at all. I end up thinking, "If you, a NT, were faced by the same kind of treatment and pressure the NDs were by society, you'd develop this "symptom" too." * and I think ND folks in art is also an example of that, with COVID proving it further- it's more fundamental and universal than we think it is.
* to explain this further, it's bad, because it results in things like "What? You don't have meltdowns? You don't look autistic," "You don't have RSD and you're super confident. You can't be ADHD, just forgetful or something," - as an example, lack of meltdowns doesn't mean no autism, it means great management or great coping mechanisms, and unfortunately for many it's the latter instead of the former. NTs also have "screaming meltdowns" if you put them under enough stress too.