Yes, unfortunately looks like you are right. Super FP flash not possible with UFL-3, but only the UFL-2. Damn. So sync speed of 1/8000 is not possible...
And the flash is of little interest for other than Olympus owners, due to lack of TTL compatibility.
So the only advantage of the UFL-3 vs. other third party strobes is the RC mode which gives lower battery drain of the camera battery and potentially faster recycle of the internal flash. And exactly the same TLL as the camera.
So worth it if you are an Olympus user, don't plan to change brand, and need a strobe in this class/size.