This is factually incorrect. There are rules regarding the bidding process for buying a property in the Netherlands (Amsterdam model, Haarlem model or closed bidding with deadline), but none of them include a part where the second highest price is used.
Interesting! I have a question about how it works in practice: In the US, there are often extra considerations beyond the offer price. For example, someone paying in cash can typically offer less than someone who needs a mortgage, due to the lower risk of the offer falling through. Or I might bid less, but require that an aging roof be replaced at the current owners' expense. How do they deal with that in the Netherlands?
I've never encountered it, and I'm a homeowner in the Netherlands. The sealed bid auctions I've seen were all regular ones were if you are the highest bid you have to pay that price.