This may actually be a taxa split thing rather than just a vernacular name being wrong.
My understanding is iNat taxonomy for birds will follow Clements checklist generally… 2018 Clements gave a split for M. fusca (Velvet scoter) and M. deglandi (White-winged scoter). I’m not sure what impact the 2019 checklist will have. Information in the wikipedia page may or may not be up to date.
I think a flag on the taxa is probably your best bet to get this looked at.
[edit: the following from Clements 2018]
617.0,split,“White-winged Scoter Melanitta fusca is split into two species, following Livezey (1995), Sangster et al. (2005), and Collinson et al. (2006): a monotypic Velvet Scoter Melanitta fusca, and polytypic White-winged Scoter Melanitta deglandi, including subspecies deglandi and stejnegeri.”,species,Velvet Scoter,Melanitta fusca,N Eurasia; winters Norway to Spain and Caspian Sea,Anseriformes,“Anatidae (Ducks, Geese, and Waterfowl)”,611.00,33,
618.0,split,“White-winged Scoter Melanitta fusca is split into two species, following Livezey (1995), Sangster et al. (2005), and Collinson et al. (2006): a monotypic Velvet Scoter Melanitta fusca, and polytypic White-winged Scoter Melanitta deglandi, including subspecies deglandi and stejnegeri.”,species,White-winged Scoter,Melanitta deglandi,Anseriformes,“Anatidae (Ducks, Geese, and Waterfowl)”,
619.0,name change - scientific name,Change the scientific name of the monotypic group White-winged Scoter (Siberian) from Melanitta fusca stejnegeri to Melanitta deglandi stejnegeri.,group (monotypic),White-winged Scoter (Siberian),Melanitta deglandi stejnegeri,Breeds ne Asia; winters coastal e Asia to Japan and China,Anseriformes,“Anatidae (Ducks, Geese, and Waterfowl)”,612.00,33,
620.0,name change - scientific name,Change the scientific name of the monotypic group White-winged Scoter (North American) from Melanitta fusca deglandi to Melanitta deglandi deglandi.,group (monotypic),White-winged Scoter (North American),Melanitta deglandi deglandi,Northern North America; winters to coastal s US,Anseriformes,“Anatidae (Ducks, Geese, and Waterfowl)”,613.00,33,