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Didn't see the video but doesn't that effectively mean that .NET was ported to DOS?

.net 2.0 and later are highly dependent on windows and winapi. Parts of .net core might stand a better chance at being ported to DOS.

.NET 2.0 was fully implemented as Open Source by the Mono Project.

The most recent version includes quite a bit of Microsoft code and offers .NET 1.0 through 4.x

No. It relies on Windows 95 infrastructure. And it's not a modern .NET, but .NET Framework 2.0.

It is still maintained. You can use .net 2.0 on the latest visual studio if you choose to.