I guess my point on that was 'Landsheer van de Nederlanden' should today not be summarily translated as 'Lord of the Netherlands' since 'the Netherlands' has a current meaning, as opposed to in Dutch, where 'de Nederlanden' and 'Nederland' are immediately and obviously referring to political entities at different points in time, and with somewhat overlapping but still significantly different areas.
Then again, I do know that Emperor Charles is referred to as 'Lord of the Netherlands' in English language history books, and I wouldn't easily know how to do it differently, but somehow there it's always more... padded in context?
Likewise (although it may be the same issue underneath...), equating the area of the Dutch Republic with modern-day Netherlands (which I assume he's referring to but didn't want to use that because of confusion with the previous point?) is... rather simplistic. I mean, I guess it's something someone who's never left the Randstand wouldn't think twice about, but that doesn't make it true.
But as I said, it's not like there are any factual errors I could find, and in any other writing I would have easily understood how difficult it is to convey all that nuance in a piece like this where, frankly, that nuance doesn't even matter. It's just that the combination of subtexts made the whole thing feel weird. To me. Maybe it didn't to you.