I think that is indeed the policy. however the Aeroplan site seems to have some comments left from the past on traveling with the SE.

Anyway, I don't really think this is much of an issue. I never had a problem using it for my wife. I even seem to recall that at one point mentioning that yes, I planned to be on the same flight kept them happy.

Still I am pretty sure the restriction to being on the same flight was removed when real IKK castration took place. That is, when it became restricted to R inventory instead of any J seat, and when the miles required were reduced back to regular rates.