I probably did it wrong somewhere but the plugin strips all CSS when activated.
I run Nginx in plesk and I already added several things without issues.
In plesk you add things in the additional nginx directives field.
For testing I left everything in HMW on default and this is the code I added:
rewrite ^/other/js/embed\.min\.js /wp-includes/js/wp-embed.min.js?XtZ_hide_my_wp=1234 last;
rewrite ^/other/(.*) /wp-includes/$1?XtZ_hide_my_wp=1234 last;
rewrite ^/file/(.*) /wp-content/uploads/$1?XtZ_hide_my_wp=1234 last;
rewrite ^/ext/(.*) /wp-content/plugins/$1?XtZ_hide_my_wp=1234 last;
rewrite ^/skin/main\.css /?style_wrapper=1&XtZ_hide_my_wp=1234 last;
rewrite ^/skin/style\.css /nothing_404_404?XtZ_hide_my_wp=1234 last;
rewrite ^/skin/(.*) /wp-content/themes/Newspaper/$1?XtZ_hide_my_wp=1234 last;
rewrite ^/ajax /wp-admin/admin-ajax.php?XtZ_hide_my_wp=1234 last;
rewrite ^/inc/(.*) /wp-content/$1?XtZ_hide_my_wp=1234 last;
rewrite ^/(readme\.html|license\.txt|wp-content/debug\.log|wp-includes/$) /nothing_404_404?XtZ_hide_my_wp=1234 last;
rewrite ^/(((wp-content|wp-includes)/([A-Za-z0-9\-\_\/]*))|(wp-admin/(!network\/?)([A-Za-z0-9\-\_\/]+)))(\.txt|/)$ /nothing_404_404?XtZ_hide_my_wp=1234 last;
Restarted the server, cleared cache but it breaks my site.