Regardless of how shady OpenAI's aims may have been, I genuinely think the root cause of this is that someone at OpenAI foolishly used ChatGPT to automate boring tax paperwork. ChatGPT decided "John Q Vesper" or whatever was a statistically plausible name for the CEO, and this dumb mistake wasn't caught by a human because nobody wants to read tax paperwork if they think a magical talking robot is capable of what seems like a routine task. I am assuming OpenAI didn't intend to tell a ridiculous and easily falsifiable lie in its tax filings (especially if that lie contradicted their public explanations about Altman's management of the fund!). OpenAI probably wanted the paperwork to say "Sam Altman."
FWIW the IRS is generally forgiving of good-faith tax errors, but I would suspect "we spent so long lying about our chatbot that we ourselves forgot that it's dumber than a pigeon and doesn't actually understand human language" doesn't count. Considering how many two-bit lawyers got in significant legal trouble for relying on ChatGPT hallucinations, it would be outrageous if OpenAI manages to get off scot-free here.