No, you participated in that thread
It is just that the NS customer support email was not very clear/potentially misleading. The SL is fundamentally directional, not twin. Not very directional (so you can get close to a twin riding experience), but directional nonetheless.
Just looked at that thread
out of interest and it seems pretty clear from the emails that the SL and the heritage have symmetrical sidecuts and the inserts have a 0.5 inch setback for slightly better carving/float.
The video you posted (from NS) states the opposite that the sidecut is setback on those two boards
Which one is it.