tl;dr: The Cybertruck is not brutalist because it's designers do not promote the same politics as brutalist architects:
> But Banham and his fellow brutalists had a purpose behind their intense design, something more than just a building.
> And on this, Pasnik, argues, the two groups — Brutalists and Tesla designers — couldn’t be more different....
> “The truck is consumerist, whereas brutalism’s monumentality is civic. The truck’s boldness serves the bravado of an individual, whereas brutalism’s visual power was meant to project the shared dignity of the public realm.”
> But Banham and his fellow brutalists had a purpose behind their intense design, something more than just a building.
> And on this, Pasnik, argues, the two groups — Brutalists and Tesla designers — couldn’t be more different....
> “The truck is consumerist, whereas brutalism’s monumentality is civic. The truck’s boldness serves the bravado of an individual, whereas brutalism’s visual power was meant to project the shared dignity of the public realm.”