its not necessary every CVT looks as PRNDSB - usually S is for turbo Variants/Powering like a SPORT, whereas function of both D & S are same both used for forward moving while comparing with D, S is move in power then D work in ECO as compared to S and B is Engine braking/drag while up/down hill for minimizing the paddle brake.
Both PRNDSB and PRNDL is cvt bcuz wherever you have only D as your forward Speed Transmission its a CVT, cuz all 5 or whatever Speeds in D works as per acceleration intelligently.