Quick confirmation here.

No request was needed at checkin or anything for a voucher, I noticed the PP lounge thing on my mobile BP. Went to the AC MLL Intl first, just due to location, much better than domestic which is where I usually am, also much quieter. No access to the TB lounge like star alliance lounge finder said I would have. Having worked at YVR I was pretty sure about that already but wanted to confirm with my own eyes. Got to the PP lounge the guy almost looked a bit confused but then I saw he had an old school dot matrix print out with names, being an A mine was the first one of about 6 on this flight so he checked me off and that was it. I dunno if those were the only 6 star gold/biz customers on this flight, that'd be hard to believe but I'm I think it was as the other flights were separate on the paper.

As discussed in other threads this PP lounge was far superior. Lots more food, full meals, plenty of booze from the bartender and about triple the size it seemed. Both lounges were good, AC had more food options coming when I left but at least I know it's better than the DOM lounge. Either way both were nice and it's great to have options!