I don't like the idea of linking VPN usage with something shady or illegal. Privacy is a human right, and knowing that I'm using a VPN or not doesn't change how "authentic" or truthful the post is.
"A guy that posts popular incendiary takes about US politics like it's his job is routing through VPNs and his real location is unknown" might be valuable information to the public.
Does the distinction not make sense from your perspective?
And I think that the Nazi-salute guy who runs Twitter is playing a game with this.