See this Twitter thread I shared (I work for Google Search) on our before/after commands we added to make it easier to do this type of searching. It also explains why it is sometimes difficult for us to determine the date of a document: https://twitter.com/searchliaison/status/1115706765088182272
I don't think this has to do with the issue I mentioned. Google has gives a date for these articles when you do a regular search. As I mentioned, these are mostly around 2011. Again, these dates are coming from Google, not the site. If I do a time range that includes 2011 in it, even a time range that includes the entire existence of the internet (1900 to 2022), all of the sites except one disappear. It's not a matter of Google getting a date wrong, it's a matter of Google not displaying hits that it should be displaying per the data in its own system.