i doubt it, as they received a patent on it. its must either be a new feature or a totally new way of doing it. if it wasn't, it would have never made it through USPTO examination.
edit: i did a quick read on high speed blow off.
http://www.patentstorm.us/patents/5113980.html
it's very different. high speed blow off valve is normally closed, and opens upon meeting a certain amount of preset amount of pressure, basically like a bov for a turbo.
the FSD bypass is totally different. the bypass valve is normally
open, and closes during movement of the shock. how fast it closes depends on how fast the fluid is moving. the faster the fluid is moving, the slower it closes, and vice versa.