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.
By the way, Rails is the craze from maybe 10-6 years ago. consider e.g. [0] But it is still far, far from dead. Time flies, but not as fast as you suggest.
[0] https://www.google.ca/trends/explore?date=all&q=ruby%20on%20...