Why are you trying to remove the acf fields using remove_meta_box? A better way to do this would be to add a filter when ACF gets the field group and to alter the location rules so that it’s not shown if your setting says to hide it.
add_filter('acf/get_field_group', 'my_alter_field_group');
function my_alter_field_group($group) {
// alter location rules
return $group;
}
To see what the location rules should be and how to alter them, output a field group to code and take a look at the location argument array.
