I totally agree that there's no disputing the origin of techno, but personally I'm not convinced it matters much to the broader history of jungle. Two reasons: house predates techno by several years; and the historical connection from house to jungle is a bit easier to trace than any influence of Detroit techno.
Both Chicago house and NYC/NJ Garage house developed in the early to mid 80s, whereas techno (as a term as well as a cohesive sound) didn't become a thing until the late 80s.
To be clear, I'm not trying to downplay the absolutely massive importance of the Belleville Three at all. But I would consider Juan Atkins' early work to be electro, rather than techno. And meanwhile Kevin Saunderson's best songs always felt more house-like than techno to my ear.
Anyway, jungle's most immediate predecessor was UK breakbeat hardcore, which combined breakbeats from funk and hip hop, with synth influences from acid house (Chicago) and new beat (Belgium), among other house-derived genres. I guess I just don't hear much of a techno influence in early jungle. In my view, that doesn't come in until some slightly later drum and bass subgrenres like techstep.
That all said, definitely agree that the timeline described in the article (which gave credit to Germany and the UK) is just plain wrong.