I hope they distinguish between music and vocals. Coding to techno has subjectively gone pretty well, and it seems reasonable that hearing words should be more of a problem.
That's the question. Maybe you would, in fact, code "better" (whatever that means) with complete silence.
I'm interested in the difference between music you're accustomed to and music that's less familiar, words, no words, loud, soft, silence, etc. You think you like techno, but maybe, just maybe, objectively something else would be better.