The Netherlands didn't endure much suffering. In fact, quite the opposite.

The highest point in the Netherlands is 322 meters (https://en.wikipedia.org/wiki/Vaalserberg), so even the mighty Dutch might have a problem with a 500m rise in sea level.

I think they're referring to the increasing intensity of severe weather.

Not only that, but also the massive loss of land that is currently dense urban area, and the massive loss of land in general. There will have to be huge reconfigurations of where people live and what people's livelihoods are. I am not optimistic that such changes can be managed among several billion humans without war, famine, etc.

Seems par for the course of human history no?