A few answers:
The updates are to the lens module not the lens itself.
We did do a number of pcb panels but did make a couple of changes to it. (the changes were definitely a good thing for the future). All the panels get separated, inspected and run through numerous tests.
8KX electrical passing the pcb inspections and panelizing tests is indeed a big deal.
Multiple demos are constructed with parts to build a lot more. Demos like these are used to verify the assembly process among other things.
Plan F doesn’t state 100%, I’m told there are a couple or so that haven’t been shipped or in process.