Granted, I should have read the notice from the CRA more carefully. Nevertheless, in spite of what the notice said ("Auto fill will be not unavailable from Feb 5 to 22, 2021), ALL was NOT  shut down because, as I mentioned before, I DID auto fill a number of tax returns just a few days ago ("DATA IMPORTED ON FEB 11 2021 06:59:29 PM"). Thus, it's always a good idea to try!