wp_verify_nonce for comment form is not returning false

Instead of adding the nonce_life filter and then immediately removing it, try telling WordPress that the lifetime for your nonce is 30 seconds.

add_filter( 'nonce_life', 'wpse426626_my_nonce_lifetime', 10, 2 );
/**
 * Sets the nonce lifetime for the creacomments nonce.
 *
 * @param  int    $lifetime The nonce lifetime.
 * @param  string $action   The nonce action.
 * @return int              The filtered nonce lifetime.
 */
function wpse426626_my_nonce_lifetime( $lifetime, $action ) {
    if ( 'creacomments' === $action ) {
        // Sets the creacomments lifetime to 30 seconds.
        $lifetime = 30;
    }
    return $lifetime;
}

Then use the nonce as you already are.