Hi,
I’m using exactly this plugin (“Hide Admin Bar Based On User Roles” on the plugins list in WP is listed as “Hide Admin Bar From Front End”). The problem was that probably new roles was added. When i checked it in plugin settings, the “!Improve Hardening” header disappear.
BTW, what was changed in your last update, one week ago? Why the changelog is not updated? Last info in change log was added with version 1.2 on January 2020.