Hi Malae,
Yes, we are aware that PHP 5.6 is not outdated, let me clarify that for you.
When an user runs PHP older than 7.0.0, the below warning is displayed in WP Healthcheck:
Your PHP version (5.6.32) is compatible with the current WordPress install. However, in order to get better performance and other improvements, the WordPress team recommends you upgrade your server to PHP version 7.0.0 or greater.
As you can see, we don’t say that PHP 5.6 is outdated or won’t receive any security updates. We only say that user should consider to upgrade to PHP 7.0 ??
We just follow the requirements from WordPress requirements page (https://www.ads-software.com/about/requirements/).