Hi Lorenzo, I do not know any non-origami art people who say that origami is art.
Some origami people like Eric Kenneway argued persuasively that origami is not ‘Art-with-a-capital-A’. Dave Mitchell also said that origami is not art, but “if I fold paper in order to satisfy my aesthetic sense (because I find process of folding paper, or the result of that process, beautiful) then that is indeed art, and art of the purest kind.” https://www.origamiheaven.com/abrieftheoryofart.htm I think George Hart’s observations about ‘math art’ could apply equally to origami: “[the accepted art authorities judge] much of what is presented in our art exhibitions and publications is not truly ‘fine art.’ The sad truth is that no experts from these organizations are rushing over to our mathematical art exhibitions and being impressed by what they find. We must admit that in terms of their culturally accepted notions of art, something is lacking. ... [the works] of the math/art community are largely craft, design, models, and visualization, not fine art. ... To reconcile these issues, perhaps what we call an ‘Art Exhibition’ should be rebranded as something like ‘Exhibition of Mathematical Art, Craft, Design, Models, and Visualization.’ ... Beyond any benefits of self-honesty, this labelling might aid us in appearing more modest to any fine art communities that consider our math/art to be below their artistic standards ” Regards, Tung Ken
