I talked about the VTF thing in other posts. But it's a long thread. The OAK 28R approach has a series of stepdowns prior to the FAF. The VNV profile in his avionics sets up the series and gives him vertical guidance to meet each. But his autopilot does not have VNV functionality, so, flying with it, he would literally have to dial in each succeeding altitude until the FAF became the active waypoint. (He got royally screwed up by this in some earlier, more "famous" videos when he was expecting the autopilot to do it and ended up in one of his famous dive bomb sequences.) And hand flying would be doing so manually. That's potentially a series of descend/level off/descend/level off changes. It turns out the extended glidepath on this approach keeps you above each stepdown. So all he is doing by switching to VTF is making the FAF the active waypoint and picking up the glidepath early. I'd probably do the same in this situation. Of course, being Jerry and apparently not really understanding the why and the limitations, he just uses it in all sorts of situations. Some unnecessary. Some not appropriate. Mostly harmless but some potentially dangerous because I don't believe he really understands the approach or is paying attention to those stepdowns.