I concluded that WordPress can be completely hidden only on static sites, business cards sites and so on. Next, I will use the basic functions of the plugin that directly affect security. For example, hide the login page. Until the moment when hosting broke, I changed the wp-admin as in the video, but after that the CSS broke and I barely returned it.
It seems like you have renamed wp-admin path name in your previous installation. In such case the import might not work well (new wp-admin path will not work). Now I can login to your site, but cannot access the backend. Please, let us know your site’s FTP credentials so that we can fix this for you. Thanks!