I think the general gist is… not as much your body’s resistance as the circuit as a whole. IE a high voltage power source traveling through a high resistance circuit, vs touching the high voltage source directly.

It’s about the full path the electricity takes (not counting any portion that you may be cutting out if you are giving it a faster path to ground allowing it to bypass some resistance), rather than just the voltage of the source.

That’s the point that’s trying to be made in that statement, the voltage is indeed a critical part of the equasion. Just not the sole portion of importance.