Doesn't actually matter who said it, what matters is what it says. In our context; just because I can't explain why it works doesn't matter, what matters is that it works. As an example, when I was at college there was still argument over exactly how a wing produces lift. That doesn't seem to have stopped Boeing and Airbus from producing many thousands of aircraft
Possibly, just possibly, because experience* tells me that connecting just one wire doesn't work?
Have you tried putting a pot of yogurt on top of an amplifier, does it make a difference?
There are people out there who firmly believe that supporting their speaker cables on little bridges makes a difference to the sound, others will spend a fortune on a super fuse. Both are actually harmless. Equally harmless is using a 20VA power supply in place of a 10VA power supply, as long as the output voltage is correct. If I connect a 90KVA power source to an an aircraft that requires 30KVA does it do any harm, no the industry standard ground power is 90KVA it is done all the time.
*Experience and training.