You can't accuse something of being a dog whistle only when Person A says it, but not Person B. It either is or isn't. To do otherwise would be applying a double standard.
I don't think Lindell is a nazi, but I also don't feel sorry for him for having to fend off such accusations, since he is an enthusiastic trafficker in conspiracy theories in his own right. He could make the non-troversy go away any time by changing the price to some similar number, but probably sees it as free advertising.