High impedance temporary jumper connections are spread out evenly top and bottom instead of stacked all on one. Temporary connections are bad news in signal path, whether jumpers, switches, pots, tube pins etc.
The interesting thing would be to compare the diagonal wiring to biwiring to see how close it comes. And also to compare diagonal to traditional connection with cleaned contacts or contact enhancer to reduce impedance of the temporary connections.
I have read a lot of "free audiophile tweaks" lists, even some that i have paid for, none ever mentioned this one.