I guess it's a bit more subtle.

The point that the article makes is about opening up NeXT to other hardware platforms. So while from one perspective, you might argue it lives on inside Apple, you could also argue that's where nextstep died.

In the early 2000s I worked for a company that went all in on NeXTSTEP a decade earlier. The product was developed in a "4 GL" called 4D or 4th dimension.

We had to do a painful migration to windows nt/xp because NeXTSTEP was discontinued and apple actively fought to kill attempts to fork or open source the code base.

You could port tons of code to GNUStep or that other Cocoa libre API.