In TFA, "EdTech" refers to things like grade-school subjects: e.g. learning to do fractions. In this respect, replacing human teachers with software/apps is what's being debated. The consequence of this replacement is a sharp drop in face-to-face engagement, and the substitution thereof with 1:1 screen time.

You provided some examples of auto-didacts teaching themselves useful life skills via YT. I think these are good resources for such folks -- I know I've benefited from them myself -- but it's hardly in the same ballpark.