This is far more Mondrian/Bauhaus than anything else.
Yup. A lot of people working in design and tech have bypassed formal education, so they missed out on the (important) history lessons. (Not a dig on anyone who didn't go to design school, just that it should be in one's best interest to learn about what came before, what was and why. I have found that the best in almost anything are typically great historians of their field.)
Many think Brutalist web design is anything that is intentionally big/sloppy/not neatly and compactly designed/breaks typical patterns.
I feel like this goes for any of these 'brutalist' websites:
Just because you can do something, doesn't mean you should.