It must be very context specific; I'm in IT, in an English-speaking country (Toronto,Canada), and don't even remotely think of "Tech" as "front-end user-facing software only". :-/
What kind of companies do you call "tech" companies then? I can't really understand the objection I'm facing, when people tell you their stock portfolio is heavy in tech do you really think companies other than the one I listed? I live in the Bay Area so maybe things are skewed to "local" companies but I held a similar opinion when I was still in Canada too...
EDIT: Just to hammer it home, search "is faang tech" and weep that "corporatefinanceinstitute.com" is on my side
of course faang is tech. Your assertion was not "faang is tech" it was "faang is all that tech consists of". These are not equivalent, and I recommend you view [1].
EDIT: Just to hammer it home, search "is faang tech" and weep that "corporatefinanceinstitute.com" is on my side