I was very skeptical of the idea of a bot encyclopedia myself, but after looking up a few random articles and comparing them with human-authored encyclopedias, I can't say it's worse. One of the articles was actually substantially less biased than the Wikipedia version.

The LLM sources from the same reliable sources as Wikipedia (including Wikipedia itself). Wikipedia is arguably easier manipulated and known to be heavily astroturfed by governments, corporations and political activists. To manipulate Grokipedia you'd have to either hack xAI, which would almost certainly be discovered, or rewrite all its sources.