I've never had one in my hands to look at but from the pics it looks like the front suspension is just a conventional double wishbone set-up with an upper plate on pivot balls acting as both a bellcrank (like a pushrod suspension would use) and a sway bar. A very neat but kinda silly design.
Edit: Correction. Apparently the one I was looking at was hopped up with shocks. Looks like there was also a basic design that had no shocks/springs but instead just had a finger on the back of the plate bolted to a standoff on the chassis so yeah, I guess you could call that a flex plate.