Don’t they mean to say “replacing the entire U.S. federal workforce with ChatGPT”? Surely that is the future everyone is looking to.
The 80% don't need AI to do their taxes. They didn't in the 1970s and 1980s, and they still don't.
But based on my experience with AI-generated code reviews, the IRS could definitely generate all kinds of “problems” for you to address in your return. Maybe even boost revenue by insisting on bogus extra unpaid taxes. What could you do to respond? File a ticket against the bug? Meanwhile you are menaced with fines.