A brief update on this, as it seems there have been no updates for the last few years.

I am in the YYC INTL Aspire lounge now. I can confirm that it's open, and also that an AC J BP (still) grants access.

The lounge itself seems reasonable ... but it's empty. There are only a tiny handful of people here. There is some hot food, but not much (overly dried rice and beef stroganoff) and some drink (but not a huge selection) ...

But if you're departing YYC INTL in AC J, this is certainly still an option in terms of basic lounges.