I think both of you are right, if the Boss/Senior is more qualified in the subject at hand a 2 cent is more than welcome, the problem arise when the Boss/Senior is not more qualified.
I think the article is simply that if you are pushing for a very small change, one that would make not much difference, and is just a matter of opinion, then don't do it as it will impact negatively the original author.
Bosses shouldn't be bossy except in rare circumstances.
Most of aren't the creative director, so don't enforce your idiosyncratic aesthetic on your team members.