From you statement I would be led to believe that the ultimate 'top of the range' is like 'The Emperor's New Clothes' - no valves at all!
That must help in a 2 stroke I suppose (I'm not including reed valves)
I had a search for that MX SX Pro-Racing and it is just a crap motocross sort of Facebook page just selling friggin stickers.
In the words of our immortal Senator Hanson (who even the Trump camp has now condemned) "Please explain"