"detected using at least one of the technologies we track in this group" - does this mean some technology usage could be higher but it's absent because they're

"detected using at least one of the technologies we track in this group" - does this mean some technology usage could be higher but it's absent because they're not tracking it? Frameworks - How the hell do they "track" some of these frameworks here because the produced html/css/js could look exactly the same coming from say flask on python and jersey/jax-rs on java?