I'd wager most folks who know about wpa_supplicant didn't learn about it in school. Hacking around wifi on laptops wasn't a school thing, it was often the same sort of thing this is... self-exploration.

Just depending on age you might refer to it as "a tool called wpa_supplicant to manage its wireless connections, which is not uncommon on older android versions" vs "wpa_supplicant, an old standby Linux wifi management program" or somesuch.