It does show that the motor starts and apparently the clutch and first gear are working. A high-speed pass, WOT, in top gear would be much more confidence inspiring.
After TeddyG's experience with his BaT purchased SF2 that looked really good in the BaT sales pitch but has turned out to need major motor work, I think we all have to be cautious of the possibility that, while there may be some diamonds somewhere, there are a lot of "polished turds" as someone else here put it so eloquently!
That said, if the price doesn't escalate rapidly, seems likely to bought and parted out very quickly by one of the mid-west companies that have done so with Laverda twins in recent years - no worries there about history, performance, and paperwork.