Yes, that's it "TT saw that this was the second year I received a 1099-MISC from Twitch and made me complete a Schedule C".
A second year of the same income makes it more likely that it's self employment, and not a hobby*. But , if you think it isn't, answer that question that you "got the income in 2021" only. Lying to TurboTax to get it to do what you want does not constitute lying to the IRS.
*For help in making that distinction, see
https://www.irs.gov/faqs/small-business-self-employed-other-business/income-expenses/income-expenses
