Yes, the article does not give a clear answer. However, simply looking at the text of the CFAA leaves little doubt that you'd be in violation if Netflix clearly

Yes, the article does not give a clear answer. However, simply looking at the text of the CFAA leaves little doubt that you'd be in violation if Netflix clearly communicates that you aren't allowed to log in with someone else's account. It's hard to imagine how an account holder could authorise you to access Netflix in a situation where Netflix explicitly communicates to you that such account sharing is forbidden.