I think that what you are seeing in that image might not be a matte/gloss visor i think that it might be dirt/grime on the visor that the artist just cuts off at the "parting lines" because it looked artistically good
If you look underneath the "brim" of the helmet it has matte like smudges there too
on that note though
to have the visor look dirty and smudged like that pick would look really cool
and certainly a two part matte/gloss visor custom made would be cool
to get the effect you might want to also look into some simple clear matte spray. it might give you a decent matte finish. i dont know though you would have to try it out