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I think he means built-in to the OS. He probably uses something like the ones you mentioned, as he claims that the "only must-have app I need is a global clipboard history application."

Yeah, I had a similar reaction. I had been using the dual Office/VS clipboard ring since back in ~2002, but I forgot that it was only for applications with Office integration and not OS-wide.

First thing I thought of was the Emacs kill-ring. Emacs has been around since the 70's, so it's not like the concept hasn't been out there for awhile.

He uses Windows so I assume he doesn't know much about Linux Distros. You're correct, Klipper was the first thing I thought of as well. I assume his OS experiences are: Mac, Windows, iOS, Android judging by his info posted.