Just to be clear, the first extension mentioned - the way I read it - was an extension on the handle of a torque wrench. Making the handle longer.An extension doesn't affect torque.
Well, it does on an impact.
Snap On torque extensions are different thicknesses of spring steel extensions to torque nuts down with an impact. When the torque is reached, they flex under impact and quit turning the nut. But they only work on impacts, not a ratchet.
The reason the Bosch bit reached a high torque rating is it didn't flex. When it broke, it shattered.
Lots of talking past each other in this thread.