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Am I right on this, anyone?
To an extent. Prooflike/Deep Mirror Prooflike surfaces are not always accompanied by the frosted devices we tend to associate with them; that's a function of the condition of the hub from which the dies were made. An older hub can still produce Prooflike surfaces, as they're a function of die polishing in many cases, but the devices could be almost "shiny" on their own.
I hesitate to pronounce polishing on a coin from just a photograph; there are too many variances in lighting technique to make such a diagnosis easy. However, in this case, the haze on the devices noted in the larger pics pretty much seal the diagnosis.