The substack username "patriotone" is pretty revealing. Reeks of QAnon nonsense, the posts themselves contain some pretty obvious dog whistles too.
This isn't hard stuff.
But these days those words are treated like magical incantations by hacks trying to make it believable when they assign labels to the wrong'uns.
The point of a dog whistle is to be obvious to anyone clued into its subcultural framework, but slip under the radar otherwise.
I think it is valid to call something a dog whistle as long as it's something where a sizable number of people get differing impressions of the meaning of a statement.