Hmmm, I just had a quick look (at only a handful of dates), but I saw award availability at PH Tokyo almost all nights. A couple things to remember:
1) Even though you can possibly see a paid reservation as available if you are logged into your GP acct, that doesn't mean there is really rooms open. You could very well be seeing the "Gaur Avail" rooms which is the Diamond (and now it looks like this perk has been extended to Plats too?) Room Availability Guarantee. The dates that I saw "Passport Plus" rooms for awards, it was in fact this rack rate guaranteed room that was the only room available. Maybe that's what you're seeing?

2) There are still capacity controls (or blackout dates?) for extraordinary demand dates such as New Years Eve, Fashion Week, etc where the hotel can not make awards available. Nobody knows how many dates there are that each hotel can claim extraordinary demand, that will be interesting to find out. This seems to be the case for NYE at PH Tokyo.

BTW, like I said, I only looked at a few dates and the above was what I saw. It very well could be that you have looked at more dates and are seeing actual inconsistancies with the new policy. You should definitely call GP to find out what is going on if that's the case.