Well, the article is wrong about women on the throne. There were women on thrones long before the Netherlands actually existed as 1 united country (Elizabeth I of England for example), and our fiorst female reigning monarch would be Queen Wilhelmina, under the regency of her mother Emma in 1890, long after Queen Victoria, Queen Anne, Queen Mary etc. of the UK, Isabel I and II of Spain, Christina of Sweden, etc. etc.
I suppose van der Linden could mean that in 1983 equal succession laws were implemented for males and females, but this was only after Sweden passed such a law in 1980.
About the HRH: that the PoO and princess Maxima don't want their children to be adressed as HRH now is hardly something new, I have a hard time imagining if the Norwegian courtiers adress Ingrid Alexandra as HRH when speaking to her for example. The website of the RH does use HRH for them though.
Since the article is based on an interview with the editor of a gossip magazine these mistakes were to be expected. I guess the mistakes were meant to illustrate their main point., which is how close to the people, down to earth, democratic etc. the Dutch monarchy is? The commoner-thing is also a bi bogus considering most commoners entered the royal families in the generation of the current monarchs.