Yes, this is an attempt at "Super."

I can see how in Japan they got to Super, but Hupel is a stretch. Trying to think of any linguistic reason for this.

As far as saddle choice with two bolt seatposts, I am quite happy that I use "carved" saddles that let me access the bolts from the top.

I consider these types of seatposts an extra security measure from would-be thieves.