*Labor* have only ever opposed the original PPL scheme because they didn't agree with women like Clive Palmer's wife qualifying for PPl.
Now they are opposing this current form, because they say the PPL was designed to be a top up on employer PPL, and it isn't "double dipping", and rightly so.
This has nothing to do with unions. And if you asked any union member is Labor is "for them" they would say what I am about to say as a union member. They are not for unions, they may be slightly less against them that the LNP, but they are not for them and they haven't been for decades.