In the year 2000 I read a lot about the history of the "van Nigtevecht" family maintained by someone in Weesp with the same family name. The information on this personal website seems lost. I read a lot of details here with reference to archives no longer available on the web. It may be available within in old historical paper archives held by Dutch authorities and organisations. We have to remember that what's available on the web is only a small portion of all the historical documents. Much of the material can only be traced via extensive research visiting places and requesting copies, if allowed.
We think the internet can give us correct information, but this depends on what has been transferred from old paper archives, if not lost during conflicts. I discovered that even AI gives often the wrong information "reading" wrong, speculative or unverified documents. Converting all paper history is sheer impossible due to the enormous effort and excessive cost involved, but a lot has become available thanks to scanning and people's interest in genealogy.