No, like I said I hard-coded a new function at the end of functions.php to get that 2020 date to show up in the footer on https://chickadeewebdesign.com :
function catchkathmandu_footer_content() { echo ‘Copyright © 2020 Chickadee Web Design. All Rights Reserved.’; }
Now I have just deleted the new function from functions.php and the website shows 2019 again in the footer.
You need to just put back the option to set the footer text in the Theme Options in the Customizer as your documentation says.
(I refreshed the web cache using the WP Fastest Cache plugin, and also cleared the browser cache in both Chrome and Firefox).