This year for 2023 you do have to log in or create an Online account. But just to register the program. They are enforcing the limit of installing it on 5 computers you own. But your returns are still only saved on your computer.
See this FAQ for why do I need to sign in to an Intuit Account this year? And how to Install and Activate
https://ttlc.intuit.com/turbotax-support/en-us/help-article/license-information/install-turbotax-cd-...
