Having worked in Unity I'd take engineering advice from their top execs with a grain of salt.
This guy in particular has collected some serious credibility. In the past he's worked at Insomniac Games. He is also credited for popularizing Data-Oriented Design and has delivered at least one talk that went viral and that video thumbnail of him in his red flower shirt has become a meme for a no-bullshit and requirement-focused engineering approach. Go check him out on Youtube.
I'm confused. The blog post is written by Adam Johnson. Are you referring to Mike Acton or Adam Johnson?
I never heard of Adam Johnson before this HN post. From his books, he appears to be an expert in Django. Yes, I agree about Mike Acton and his ideas around Data-Oriented Design. It sounds like a very interesting approach to programming in a resource constrained environment.