That looks like a dynamic gzip error, eg when various parts of the page are separately generated and assembled live in (say) Tomcat, and some of the elements can be prematurely gzipped before being added to the main page body and compressed again.

It's a message from aliens. In a nutshell, it says that all efforts to keep humanity alive are futile, and good luck for our self destruction. They say it's not entirely but mostly because of Windows. If you look carefully, there are some intergalactic phone numbers hidden in the script. I guess it's for desperate measures, just in case someone wants to be saved.