Watson wasn't pretending to teach a survey course of styles and movements.
He was explicating the totalitarian intent of the "brutalists." And as I'm sure you know, that term, "brutalism," is one that is proudly used by advocates of modernist architecture.
If you want a little more scholarly overview of the same topic, there is Tom Wolfe's "From Our House to Bauhaus."
Brutalism =/= the sum whole of modern architecture.
It is just the low-hanging fruit that launches a million diatribes about how anything not neoclassical, Gothic or Victorian is garbage architecture.
And it isn’t proudly used by architects. It was a style that was controversial then as it is today. And yes lots of it was garbage, and a few examples were somewhat good for the time.
He also puts up an image of the Pompidou Center for some reason. A building that isn’t remotely in the same league as a Stalinist apartment block. It is one of Paris’s biggest draws, along with that tower that was also considered to be be a building that “sucks” when I was built.