Writing Rule 0: All writing advice is wrong, find what works for you.
This is the
#1 Excuse people use to Ignore instructions.
Also the
#1 Reason why editors at publishing houses
reject manuscripts.
In all honesty, I didn't watch the video, and my comment was directed at writing as a process rather than as an art/product.
In terms of the
process of writing, it is absolutely true. Some people need to create detailed outlines in order to write. Others do better just sitting with a blank sheet of paper/document and writing from scratch. Common advice for someone writing a first draft is to not worry about editing and just write whatever comes to mind. Yet, I've found my mind simply doesn't work that way, and I have to ensure earlier text is saying what I need it to before I can proceed. It is up to every writer to find a process that works for them. What works for someone else may not fit them and that's okay.
Now, writing as an art or end product
should follow certain universal rules as you suggest.