Long interconnect/short speaker and short interconnect/long speaker - I’ve run both, and really haven’t been able to really tell a difference between either configuration. And this was with single ended RCA interconnects. I was lucky to have pretty clean power in my new construction home, plus a very benign EMI environment.
What Paul says ^^^ in his initial opening to his video was my understanding: short interconnect/long speaker is best, since the preamp can’t drive the long cables but the amp surely can. But the other side of the coin is that the amp’s output drive capability, damping factor, etc. is best with a short run of cable. So you’re in a double edged sword configuration.
Now with XLRs, however - that changes things up a bit. If you have XLRs, then a long run to your amp should provide you a very clean signal to your amp, then a short cable run to your speakers; the best of both worlds.