"Even in manual mode, it'll prevent you from downshifting into a range that would over-rev, "
"nothing stopping you from shifting into second gear at 100 mph and leaving a trail of parts behind you! "
So what's the answer here? I've only tracked my car once and kept it in Sport Plus auto and there were times when getting back to WOT it would kick down. Next time I will try manual so I can already be in the lower gear, but that will involve downshifts.
Those are my comments you quoted, however you cut the rest of the discussion out so there is no context where those comments came from. The first line you quoted is talking about the PDK
The second line was talking about a manual transmission car, not PDK. Both PDK and manual will stop you from over revving the motor as you shift up.
However a manual can be downshifted into the wrong gear and leave a trail of parts, AKA "money shift". A PDK will not downshift into an unsafe RPM, so it has protection both going up and going down, even if the PDK is being shifted manually (not to be confused with a "manual" car)
Hopefully that clears up those comments