Notably, the terms "UX" and "experience" are not present in that document. UI and UX are different things. UX is a newer concept that is more based on observing users and their emotional reactions to using the product.

UML and functional definitions and iso standards are still important, it's just not UX.

Good luck never observing users using your product. Not everything is a space shuttle, recall that we are talking about toothbrushes here.