I couldn't say for sure. I guess the Motard colours are as close to flat as it comes for Arai. If you see them in photographs they look fairly matt/flat so they're probably not high gloss. I was just looking at it next to my desk and that's under fairly high intensity artificial light so may be the reason I wouldn't call it "flat"
Attached picture was taken last weekend outdoors so there it does appear more matt than gloss.
Have you checked the Shoei Hornets, although that may be the same issue?