Hi Tony,
Still a good demonstration, it's a technique I use especially with MT2 drills or precision borer, with a drill holder which has a stopper at the bottom, used directly in the tool holder with a concentricity corrector(Centricator) it's easier to go perfectly centered on deep holes when chips give problems for example.
I never have so good results in precision on 100mm. deep or more when used conventionally, with the TH it's more rigid then I'm totally in accordance with you about this technique.

ps. i hope you can understand me, difficult to explain something in english this morning…