Where did he make the claim that you should unconditionally not run go in production?
https://fasterthanli.me/articles/lies-we-tell-ourselves-to-k...
"It may well be that Go is not adequate for production services unless your shop is literally made up of Go experts (Tailscale) or you have infinite money to spend on engineering costs (Google)."
You should tell that to the thousand of compagnies running Go just fine in production.