Originally Posted by
Zarmakuizz
That's not how I read the picture you posted. The key part here seems to be "AF or KL flight", and that applies both if you are in Business or a Skyteam Elite +.
On the Skyteam website :
On Aeromexico Lounges page, there is simply no mention of lounges available at YUL.
As stevendorechester was not on a AF or KL operated flight, OP must follow Aeromexico's instructions regarding lounge availability.
Re-reading again, you are right!