This issue seems to stem from the misuses of the term 'techno'. My understanding is that Detroit was house music. I feel like they're using the term 'techno' as an all encompassing term for electronic music. Detroit House and German Techno sound nothing alike and have different influences (and some shared influences if you go back far enough). They both stemmed from Disco in the likes of Summer's etc, but diverged in very different directions, House retaining more of the Disco musical elements, Techno retaining more of the synthesised and electronica sounds.

I could be totally wrong here, but Techno is more than just loops 4x4 beats, and so is House, so it's kind of apples and oranges. I'd associated Techno with Germany and House with America, I'm not sure there's a valid dispute here?