Are you chiding someone for knowing and communicating their confusion and assumptions? When someone is already communicating enough self-awareness to obviate that, either contribute clarifying information or say nothing.
> The company changes his name to ‘Hans De Zwart’, with a capitalized D. A small annoyance, but for De Zwart it signifies something bigger ...
which seems to imply pretty unambiguously that using "D" is incorrect. Assuming that all the information I have is what is contained in the article, this is confusing.