From the linked article :

    And so it is with written words; you might think they spoke as if they had intelligence, but if you question them, wishing to know about their sayings, they always say only one and the same thing.   

And now imagine that the only one and same thing the LLMs say is not only fixed, but intentionally steered as the biggest and most inflexible propaganda mechanism we have ever seen.

Especially given the lack of competition in the space, and people mostly using models from 2 or 3 providers.