I agree this is an interesting question and raises an area of some
ambiguity.

Regardless of what the AIM says, the important question is what ATC
uses these reports for.

Controllers in the past have said that under some circumstances, they
can use the pilot's report of leaving an altitude for separation
purposes.

However, a PD descent isn't one of them. Controllers have said that
they cannot use a pilot's report of leaving an altitude on a PD
descent/climb and therefore the reportis not useful. (However,
according to the .65, this isn't true in a NON-radar environment.)

Perhaps the visual approach and cruise clearance fall into the same
category?