You are probably right. The "Robusta" went with it when a certain form called was N. carunculata var Robusta. Then they changed carunculata to a form of N. bongso. I like the Robusta tag, as you get an idea of which plant you are getting.
As you said, I don't know if you can say bongso var Robusta
just recently when i got this pitcher on there, i moved it to higher light. i think it gets full sun outdoors for a while. its been under shadecloth for about 4-5 months. only till now has it gotten a pitcher. i the mean time ive been acclimating to lower humidity, so now im trying to move it in full sun...