Again, this is a matter about which there shouldn't be rational debate. Speaker cables serve simply as a rail for guiding an electromagnetic wave to its destination. The portion of the wave that penetrates into the cable is lost as heat and takes no direct part in the sound which results. Varying metals, twists, etc. can have no effect separate from the resistance which causes some of the power in the wave to be drawn into the wire and lost. This has been well-known for decades and subjective illusions to the contrary collapse when put to the only test in which it's actually necessary to "trust your ears", i.e. a blind listening test.
