But George,

Flycutting has been done for many years, probably as long as there have been machine shops, safely and successfully. If there is any danger it's the fact the guard isn't in place so he could film the operation but that's all. You wouldn't think anything of mounting that part in a lathe and machining it, it's the same thing except the tool is moving not the piece (I'd say the fly cutter was safer IMO)