The earliest version [1] of this page is from Dec, 2015, which is (relatively) recent. Not sure if the Archive missed it but I imagined it'd be much older page.
[1]: https://web.archive.org/web/20151213182805/https://www.googl...
[1]: https://web.archive.org/web/20151213182805/https://www.googl...
And enabled this on desktop in 2016: https://searchengineland.com/google-no-ads-right-side-of-des...