I fail to see how someone's being described by an existing concept could be considered anachronistic (Harrumph®!)

One might as well say that since the Greeks invented democracy the idea of referring to any present government as being democratic was anachronistic*.

And even if Cęsar's wife predated Plato's exposition of the Platonic Ideal, does that mean that there was no Platonic Ideal of the Platonic Ideal until that point?

*There may be other reasons for not referring to any present govenment as democratic, but that's beside the point.