How to Exclude a Plan from the Signup Page?

function hide_specific_membership_plan( $query_args ) {

    $user_id = get_current_user_id();

    if ( ! $user_id ) {

        return;

    }

    $user_data  = get_userdata( $user_id );

    $user_roles = $user_data->roles;

    if ( in_array( 'subscriber', $user_roles ) ) {

        //Post ids that you want to hide

        $exclude_posts = array( 1250 );

        $query_args['post__not_in'] =  $exclude_posts;

    }

    return $query_args;

}

add_filter( 'wcv_membership_signup_product_query_args', 'hide_specific_membership_plan', 10, 1 );