Was there something about that thread you referenced in your post that was confusing or less than clear? We do not provide our standard PHP implementation compiled with the PHP Zip extension. The post you referenced explained why we do not provide it by default, but also indicates that you are welcome to compile PHP for use on your domain with it included if you wish to do so.
The wiki has a basic guide, and the PHP manual at http://php.net has instructions for including the ZIP extension in such a compile. This is something you are allowed to do if you have the expertise to do so, but we will not provide support for it. This is not because we do not want to help you, but rather that is just goes beyond the scope of the support we provide.
We are unable to support a myriad of different customized PHP installations across thousands of servers. If this is something you feel you really need, and you can't install it yourself, have you considered seeking help from a qualified web developer to make this customized PHP installation for you?
That may be less onerous than learning how to do it yourself, depending upon your interest, budget, and proclivities with regard to these kinds of software installations.