The ingame history tabs for the German civ and Dutch civ are historically inaccurate or at most quastionable.
For the Germans:
This paragraph makes it sound like the Holy Roman Empire was ruled by the Spanish as a standard, while in reality there were only two Spanish born monarch to rule the Holy Roman Empire, of which only one ruled mainly from Spain, and that was Charles V.
Also there was a government which dictated policy, collected taxes and marshaled armies, this is just a factual incorrect sentence at the end, the only thing that is somewhat true is that there wasn’t really a central government in the sense we usually associate with that.
Policy / legislation:
Taxes:
Roman Month - Wikipedia.
Army:
German provinces is inaccurate and should be more something along the lines of Imperal Estates or (member) states. Might aswell just write German Princes, as what the Prince decided would count for the entire territory he ruled.
The small Baltic Duchy of Prussia didn’t expand at all, it was Brandenburg who expanded. The Duchy of Prussia was inherited by the Brandenburg rulers, not the other way around. The only thing the Duchy of Prussia did was give the name to the eventual kingdom of Prussia in 1701.
For the Dutch:
Holland wasn’t a European nation. In 1500 it was part of Burgundy, of which Holland itself was also within the Holy Roman Empire. Also the progressiveness wasn’t a thing yet.
It wasn’t an “accident” of marriage, that was the entire point of marriages during the time period, to secure alliances and create bigger realms due to inheritance.
Also Holland isn’t a thing during this time period, unless you only refer to the province of Holland within the Dutch Republic or to the Kingdom of Holland, which was a shortly lived client state of France during the Napoleonic Wars. It should be either the Netherlands, or the Dutch Republic.
Might be useful to mention that New Amsterdam was ceded in 1674 in return of Surinam, which was way more profitable then New Amsterdam.