Update on my moanings - QF loyalty replied to my email today, they want to ensure my loyalty is recognised and manually credited the 15k (my year ends Feb, so this is in line with the 15k/30k debate). No explanation as to why I never received it, but that's really not relevant now, I'm just happy they've included me.
So positive outcome in the end even if it did require some (minimal) effort on my part. Hope that reassures others who have heard nothing so far.
Edit no idea whether they count towards PC+, couldn't remember my total before and had already hit the 20k from flying limit anyway