BuddyPress.org

That message uses the bp_get_displayed_user_username() for the @ and bp_get_user_firstname( bp_get_displayed_user_fullname() ) for the 2nd/3rd references.

BUT if bp_get_displayed_user_fullname() is empty – bp_get_user_firstname falls back on $bp->loggedin_user->fullname

So either the core logic needs to change or you can filter on bp_get_user_firstname and just remove it

JJJ – bump the version number on the style.css?