What I said is "But at some point, when you start understanding more, something as simple as watching 20 minutes of The Simpsons in language you're learning instead of English is an immersion. "
I don't suggest watching shows from day 1. It did take me some time to build up to being able to sit through a 20/30/40 minute TV show and actually be able to follow the story. I wouldn't recommend it to people who are just starting out though. It's best they start with very short and very simple content that's fully in their target language but is created by people who know their audience is learning.
I am not native English speaker. I did learned 2 foreign languages. One of them was through very intensive program, the other one without that. It consistently seem to be that these advices are skipping the beginning and also do not conform to either my personal experience or what I observed in others.
Like, obviously you learn faster if you go in super intensive. No question about that. And your interest will fluctuate.