I imagine most people are able to tell the difference between a necessary improvement or criticism versus something that is really just opinion.

Boss sees a typo or brand color is wrong? Yeah, they say something. Boss just thinks their idea is slightly better on a hunch? Don't say something.

It's good advice.

At least hear the 2 cents out and have a discussion where common sense and honesty decide the outcome. If the boss has any history of good ideas, then only a fool would not want to hear any hunches from the boss or bosses.

The idea that "ownership" can be lost by 2 cent changes is absurd. What happened to wanting team input anyway? Weird piece.

It's likely that already the project has a combination of elements coming from more than one person anyway.

I think you might be misinterpreting the advice in this short article. This is advice for managers for their interactions with subordinates, not for subordinates in their interactions with superiors. The advice states that their very position of power may give undue weight to their casual opinions or observations.

I think it's clear that this isn't suggesting withholding of all feedback when appropriate. It's saying that a casual, "I like blue" when the design being presented is purple isn't really helpful. If the boss has data that shows that actually blue increases conversion by 5% then it is not just this "two cents" that the article is talking about, it's an entirely different conversation that doesn't fall under the scope of this article.