Add filter for specific category only

Went about it a different way, works OK.

Just in case anyone else is looking for similar functionality;

//* dropdown
add_filter( 'woocommerce_product_categories_widget_dropdown_args', 'woo_product_cat_widget_args' );
//* list
add_filter( 'woocommerce_product_categories_widget_args', 'woo_product_cat_widget_args' );
function woo_product_cat_widget_args( $cat_args ) {
    if ( is_product_category( 'experiences' ) || term_is_ancestor_of( 2921, get_queried_object_id(), 'product_cat' ) ) { 
   $cat_args['exclude'] = array(2548, 2245, 2775, 2913, 2846);
                return $cat_args;
} 
    else { 
    $cat_args['exclude'] = array('2921');
                return $cat_args;
}
}