Remove All in One Pack from the admin bar

You are almost there! If you check out where the plugin developer is adding this action, you’ll see they are setting a priority of 1000. While the priority of your function is being called at 999.

https://plugins.trac.wordpress.org/browser/all-in-one-seo-pack/trunk/aioseop_class.php#L3907

Update your priority to be greater than 1000:

add_action( 'admin_bar_menu', 'aldous_remove_items_from_admin_bar', 1200 );

Overriding function calls with plugins is a bit tricky, because you don’t know what sort of priority they set on their calls.

Hope that helps!!