Buying machinery and trying to assemble THD boards at his garage? I know assembling this board would've been expensive, but there is no way that the best decision is to try doing it at home with no skills.
Also, if the sound chip was so available when he first checked, why didn't he just bought it right then? Even one thousand of them would've been cheaper then trying to redesign now. And not only that, he is now thinking of using ANOTHER not currently in production chip BECAUSE HE THINKS IT HAS ENOUGH STOCK! facepalm, just incredible bad decision making.
They verified availability of the chip. The explanation for why this wasn't effective is one of the interesting parts of this video.
Being successful in manufacturing is more than just doing some "book learning" about how others do it. Experience counts
David is a joke among a lot of retro computing people, and utterly loathed by many others
I think the guy is good at making videos - but it's with an asterisk. He doesn't have a lot of expertise to share, but he wants to be seen in control. So the videos themselves are always really polished, but then the thing he does is something he should have asked for help with.
His retrocomputing videos seem helpful enough in the common Youtubish way.