The intent is to enable users to "opt out of tracking by websites they do not visit, including analytics services, advertising networks, and social platforms".

The intent is to enable users to "opt out of tracking by websites they do not visit, including analytics services, advertising networks, and social platforms". So you can have an analytics package on your site and do everything you mention, but you cannot offload your statistics gathering to yoursitename.statistics.net, which can track the user across websites, because the users are visiting your site, not statistics.net. A hypothetical and largely incorrect real-life analogy: you can use cameras to recognize regular clients and keep statistics on them, but you cannot send the camera images to another company to have them processed, because your clients are visiting your store, and not that other company. (This analogy is largely incorrect because camera images are more privacy-sensitive than cookies, and different legal and moral issues are involved, but there's still a similarity.)