Actually, I'm pretty sure that's where the idea originated. I don't know who started it, but I do know this: South Africa's knife laws are really strict, and prohibit any thum studs/holes, flippers, assisted opening, etc, etc. it's really strict out there
The knife makers started making manual folders that had an "elongated blade tang" that extended north of the pivot, and was used to open the knife with your thumb or index finger. These weren't flippers mind you, but manual knives. Although they were manual, you would open them just like you would a front flipper.
Since custom makers make custom knives, flippers became the rage, and they slapped some bearings on these manual folders, fine tuned the lockbar and detent, and Voilà! Front flippers were born!