The code density is the ratio between HTML code (77.15%) and the actual readable text (5.13%).
If a page contains a high code density, that means a lot of code is used to display the text.
Anyone who is not in compliance with these rules will be kicked out or banned.
The sitemap is an XML file which consists of a list of URLs of the website and a number of extra data such as a page's importance and how often the page changes.
Lipperhey analyzed the HTML code to see how the page was built up.
At best, 30% of the page has actual readable text (in your case this is 5.13%).
This is why we recommend minimizing the amount of code to a maximum of 70%.
If it is not the same, emails sent from the domain will be marked as spam sooner.