i believe what the article was referring to was the grounds. Honestly i couldn’t answer ur question because its just what i read in the article posted above. Im poor so im going to make my own so if i can figure out what it means by that statement i shall let u know.
My assumption was that potentially attaching a ground to a specific ecu pin could cause some sort of feedback. It all depends on the PFC circuits. A possible solution would be attaching it directly to chassis but that could potentially lead to other problems such as delay in the rev limiter. Common sense tells me it should work either way but i’ve seen some f’d up shit happen just by changing one ground to another.