For anyone else interested in him, Sam has a Youtube channel, but hasn't posted in awhile. He started this stuff as a teenager with a garage that I think many of us would envy now, let alone as a teenager. I've seen him on HN once or twice too. There's a whole world of these home built processors channels and they're pretty impressive. I know some others are posted in other threads, but this isn't my niche so I'll leave it to them.
https://www.youtube.com/@SamZeloof