A recent Wall Street Journal report delves into Gen Z's surprising lack of keyboard typing skills, featuring interviews with several individuals and revealing some startling statistics.
The tech-savvy reputation comes from the "digital native" narrative i.e. because they grew up with computers they must know computers, which is a silly fallacy because how one interacts with technology makes all the difference. It's the same reason why everyone who grew up with electricity isn't necessarily an electrician.
Being a tool user doesn't make one a tool maker, though having grown up in the days you had to assemble and maintain your own tools does naturally facilitate growing into the latter from the former.