Foil Body Motion?

I was looking at monofins today and came across the Finis Foil (which is inexpensive enough to just give it a try). The thing is - the advert talks about "The Foil Body Motion" as taught by Bob Gillette. I cant seem to find any reference to this technique outside of the sales materials for the monofin. Is this a real thing or merely sales propaganda? If real, can anyone point me to training or other reference materials? Bill the "foil body motion" is how he describes how Misty Hyman dolphin kicks. She had a lot of upper body movement when she SDKed. Faster SDKer's seem to keep their upper bodies still like Phelps Rallies Past Crocker in 100-fly - YouTube Michael Phelps 100 M Butterfly Rome Final WR - YouTube Though Lochte is very fast and seems to move his pupper body more than Crocker or Cavic when he SDKs Ryan Lochte sets a new World Record in 200m IM - Universal Sports - YouTube you can get a lot of info about dolphin kicking from the SDK lane

I was looking at monofins today and came across the Finis Foil (which is inexpensive enough to just give it a try). The thing is - the advert talks about "The Foil Body Motion" as taught by Bob Gillette. I cant seem to find any reference to this technique outside of the sales materials for the monofin. Is this a real thing or merely sales propaganda? If real, can anyone point me to training or other reference materials? Bill the "foil body motion" is how he describes how Misty Hyman dolphin kicks. She had a lot of upper body movement when she SDKed. Faster SDKer's seem to keep their upper bodies still like Phelps Rallies Past Crocker in 100-fly - YouTube Michael Phelps 100 M Butterfly Rome Final WR - YouTube Though Lochte is very fast and seems to move his pupper body more than Crocker or Cavic when he SDKs Ryan Lochte sets a new World Record in 200m IM - Universal Sports - YouTube you can get a lot of info about dolphin kicking from the SDK lane