Its a gray area as far as ‘shady’. From what i can tell they are selling wild types that do well in that climate. It would be different if they were passing off known varieties and changing the names.
Garfield King was the name of the guy who found the berries in Fort Kent Maine. So technically the name is kinda ok.
Here is an old post (2006) written by Jim Fruth (Pequot Lakes) - where he talks about Fort Kent King Blackberries and how he doesnt really like them…and he talks about developing his own blackberry.
https://lists.ibiblio.org/pipermail/nafex/2006-May/022245.html