I tried to click the documentation link, and my browser refused to load the page. Instead, it showed me this:

When I look at the site's certificate, the validity period section says this:
Issued On Thursday, December 2, 2021 at 7:00:00 PM
Expires On Saturday, December 31, 2022 at 6:59:59 PM
...so it expired a month ago, at the end of 2022.