Skip to about half way through the video if you don't want your time wasted.
He gets a very impressive finish for a long skinny part on a small hobby lathe.
I've seen this before but never had the chance to test it out myself. I like the idea for many reasons.
HOWEVER, I do have to raise a safety/reliability question in terms of the boring head having no positive means of being prevented from turning in the tailstock taper. If it was mentioned in the video, I must have skipped past that part. If the cutting tool were to dig in and get stuck, the force would probably cause the material to go up. The fallout from this situation may result in the part being launched, but it would most likely stay between the centres. Your setup has been compromised though, and you'll have to set it up all over again. This is all just speculation, but it wouldn't take much to come up with a means of securing the boring head to prevent one from finding out what would happen if it rotates during a cut.