I had never seen Jeff's posts pop up on HN prior to this year and only learned of him via YouTube r/homelab content. Scrolling through the hn search his domain has had plenty of posts over the years, but his content has now become stickier and/or the audience has changed?
He's definitely got brand recognition. He's THE guy for Raspberry Pi and SBC stuff. I'd suspect more people would recognise him then Ebon Upton nowadays. Not ignoring the other stuff he's done, but anyone into Pi/SBC will know him.
Honourable mentions to ExplainingComputers and "Platima Tinkers".
He shares the title of "SBC Guy" with ExplainingComputers. Any time a new single-board computer comes out, especially a Raspberry Pi, they make videos with benchmarks etc. etc.