Interesting point. I think job markets don't move as fast as technology itself. Just because a new framework comes out (and yes, in the web world, it feels like a new one pops up daily), doesn't mean an employer will say, "Ok team, let's rewrite everything in React, or Angular, or (insert your favorite new trend of the year)." A search for web development jobs will show openings for frameworks that came out 15 years ago. It's more important that a student learns to code and understands the fundamentals of problem solving and program design than worry about the latest frameworks or tooling.

HTML,CSS, and Javascript are never out of fashion. The only thing he teaches that is applicable to what you said is Ruby on Rails and even then Rails has a strong foothold on the market.

The skills you learn in routing, REST knowledge and MVC apply to any framework now and forever.

I still get plenty of headhunters looking for Rails people. Popular stacks need maintenance and new features too.