Jim Macklin wrote:
The procedure turn was never required when drawn as the
standard dog-leg turn.

Really? I never read it that way. Regardless of the shape of the
procedure turn, the rules on whether you fly it or not are always the
same.

But when drawn as a holding pattern,
then the course reversal must be flown as charted

The requirement here is the course to be flown (an acceptable hold
entry rather than a generic course reversal) not whether a course
reversal has to be flown or not. In other words the requirement is
"flown as charted" not "must be flown."