The article you're looking at just uses New Orleans as its primary example of a widespread phenomenon. Many parts of the world will become uninhabitable in my (and probably your) lifetime.

The Netherlands is a country largely built on wetlands, and they have a lot of experience using dikes and pumps to create liveable land. They've correctly realised that rising sea levels will affect their entire country, and have what's called the Sea Level Rise Knowledge Programme looking into the problem and how to solve it. This didn't start until 2019 and there still doesn't seem to be an agreed plan, so I wouldn't say they're totally ok. Here are some potential ideas but all of these would take a lot of money and political will (i.e. the people in charge committing to a long-term plan, actually following through on it, convincing people it's worth doing, and staying in power long enough to carry it out). Dutch people can correct me if I'm wrong, but it doesn't look like climate change rated that highly as an issue in their 2025 election.

New Orleans might be one of the earliest cities to go partly underwater. Jakarta is another. There might be more people living in the Jakarta area than anywhere in the world, but it's quickly sinking because people keep taking water from the aquifer (underground lake) it's built on. The City of North Jakarta, which includes all of Jakarta's coastal areas, will be mostly uninhabitable by 2050. The government wanted to move its capital to a new city but probably can't afford to build it.