It's annoying not knowing for sure if PGF drops or not, and there being no official clarification on it. If that's how it's going to be, let's do our best to figure this out by ourselves. I have an idea.
Everyone should do Olga Flow on Greenill (or Bluefull if you can't do Greenill) until a rare drops. Eventually someone will find a Kroe's Sweater or PGF, and they can share the news.