Looks like it drives the chain, so unless you have a freewheeling front hub pedaling may not be optional.
But then when watching closely, I can see there's a cut in the video between the device being placed on the frame and him testing it and in the cut the entire bottom bracket has been replaced and the chain is now making a different path through the machine, so I assume the bottom bracket needs to also have a freewheel to make it work, plus you'll need a new chain (or to join a couple of chains) to make it fit.
I assume this is a "freewheel crank" https://en.wikipedia.org/wiki/Front_freewheel
can you explain the difference for someone who never heard of either?
Hub drives apply power at the wheel hubs. They are cheaper and smoother (no backlash), so depending on application hub motors may be superior.
Personally I like help up all the hills so mid-drive all the way.
Mid-drives are certainly superior to hub-drives, so that's another plus.
Can it pedal assist? i.e. only kick on when pedaling. That's often a legal requirement.
Doesn't mention cost, weight, or battery capacity.
I'm assuming most of the parts beyond the aluminum chassis are off the shelf. It would be a nice thing to open source, or at least sell the plans so anybody* can build.
* with access to a machine shop