Not quite sure what you are describing here?
Enhanced summon isn't officially a released feature at all so we're still not clear what limitations it'll have in general..... that said, in the ones I've seen it usually tried to go forward whenever possible. For example-
Several examples of it backing up slightly (with another car parked nose to nose) and then trying to pull forward around it...(and usually failing and stopping entirely... there's a reason this feature is not officially out yet).
But autopark always parks the car in a perp. space by backing into it, so it can pull out of it forward for a reason- it's safer (regardless of the tech on the car).
In the few advanced summon videos I've seen where the car has no choice but to back out, it does- but in all those examples there weren't usually other cars on either side blocking the side cameras like you'd normally have a busy lot.
Given it doesn't have rear radar, how specifically do you suggest they make the car "see" cross traffic in reverse when there ARE cars (or more likely SUVs/trucks) parked on either side in a perp parking spot that the human driver foolishly and dangerously parked forward in?