Does this loose more microplastic than other boats?
Almost certainly; look at the rough plastic surface of it. Sea water and UV will almost certainly degrade this boat and have it shedding loads of plastic. The only upside is they didn't choose to cover it in glitter, but such coatings are certainly optional for traditional boats...
Most boats are covered in protective sealants/paints so I think this is not a major concern unless the boat crashes
I'm kind of jarred by the enthusiasm expressed here. The end-product is not environmentally friendly in any way.