Hi NSEU,
My old notes say:
"PVD unshuttered -
PVD selected on, within valid localizer region, within 45 degs of runway heading, and on ground.
"barber pole" rotates in direction of runway centreline.
Shuttered PVD off -
not within valid localizer region or within 45 degs of runway heading
above 5 ft rad alt
selected PVD source invalid"
It was available from standing still until airborne (40 kts is a red herring)
It makes sense to have the memo message displayed if the PVD is turned on - else you wouldn't know whether it was really on when it wasn't displayed (airborne say for Auto Land with possible manual roll out)