Today is a great day for you, because you get to feel good about yourself by being a first-order pedant and making basic assumptions about what I know and don't know and whether or not I've read the article.
I actually did read the article and even prior to that do know about deriving pitches from harmonics. What I posted was still correct in spite of the downvotes.
The problem is you are incorrect. The deeper your knowledge of music theory, and the more experience you have with a capella choir music or certain instruments where they can be played differently, The more apparent this will become.
Trying to sing a D# in a B major chord the same way you would a Eb in a C minor won't be a great experience.
Most of the adjustments will happen automatically if you listen to your fellow singers and have experience. But they do happen.
I actually did read the article and even prior to that do know about deriving pitches from harmonics. What I posted was still correct in spite of the downvotes.