The tag is present in Lintian version 2.108.13. That is the most recent version we know about.
The package uses pkg-php-tools but dh command is called without --with phppear or --with phpcomposer. A PECL package should also have --with php.
pkg-php-tools db addons are the recommended tool for building PHP PEAR or Composer packages. For more information, install it and read the included README.PEAR or README.Composer.