Okay I see. I thought I recognised your user name from the Insider forum. I didn't actually try a link in this thread as I already knew about the 2009 release. There does seem to be a lot of people/users plus Microsoft using version 20H2 or 2009 (in text) when I thought 20H2 was what they had used in the Insider Previews and 2009 was the public release.
As in 20H1 or 2004.