#6 low altitude weather baloons aren't at 100,000 ft - but more expensive projects are
note how the "chinese balloon" appeared in colorado far from normally published air data, whereas during WWII japanese lower altitude baloons ended up along the same path
google (china friend) has "blocked" air and space data recently. you can't get data for shit from them anymore. even accuweather has stopped publishing historic weather data, google ads in their place.
#7 many of the articles that aren't deleted off google are UK ranting about their balloon knowlege which they believe is dominant