Wow I was actually hoping this was a new feature that Arturia introduced, because this last-note-played aftertouch is something that the ME80 and Arturia Origin offer, and is very useful when trying to play the CS-80V as if from a polyphonic aftertouch keyboard.
What Arturia should really do is give the user the choice of whether to have "normal" after touch or "last-note-played" aftertouch response.