this is really interesting!!
i agree with the high level idea that you shouldn't let other people control your art, but the idea that there is absolutely no value (or even negative value) in showing your art to other people does not match my experience in reality. i have shown my work to people and then gotten feedback, giving me ideas to make a game that I MYSELF liked more.
yes it is easy to be manipulated by numbers or praise into making something different from what you set out to make. yes it is hard to resist the temptation to specifically NOT fix a problem someone told you about and stick to your vision. yes, vigilance is required.
but ultimately, it's not having eyes in your work that's the poison, it's how you respond to it.