LLMs are only impervious to "groupthink" and "organized campaigns" and other biases if the people implementing them are also impervious to them, or at least doing their best to address them. This includes all the data being used and the methods they use to process it.

You rightfully point out that the Grok folks are not engaged in that effort to avoid bias but we should hold every one of these projects to a similar standard and not just assume that due diligence was made.