Apparently the new model when asked for historical figures that were historically white would "hallucinate" more diverse persons. And the article's author is claiming that the training had these biases from the jump.
Re: the Twitter post it reads like a "I'm leaving social media' post and then the author waits to see all the engagement -- all the "no don't leave, we love you!" nonesense. Or maybe it's the radicalization origin of a tech person: oh they trained the data to be woke from the beginning, rawr I'm gonna crusade against this! sort of thinking.
It's an AI model who cares? It's not like anyone is getting their facts from it and if they are they need to be shown the folly of that. They're tools. I find them best at reasoning somewhat well about code and that's about it.