I did some tests on my side and it’s working.
I used the same shortcode as you :
[psfd_php]
if ( 0 != get_current_user_id() ) {
the_author_meta( 'user_description', get_current_user_id() );
} else {
echo 'Not logged in user';
}
[/psfd_php]
Firstly, it didn’t display anything. The reason was simple, my personnal user’s description was empty.
I put some stuff in it and then the description was displayed in the floating div.
Best Regards,
PluginlySpeaking