You clearly haven't read the article. The NS10 is an exceptionally good speaker in certain respects that are not immediately obvious and that convey vital information about a mix. It has superlative time-domain performance due to the sealed box design and the extremely stiff and well-damped woofer. This time-domain accuracy reveals immense amounts of detail that are lost on a conventional reflex-ported nearfield monitor. Crucial decisions about phase and balance in the bass and midrange frequencies are far easier on an NS10 than almost any other monitor. They're not pleasant to listen to, but they produce good mixes, which is entirely the point of studio monitors.
A speaker with similar performance and a similar role is the Auratone 5C, or the more modern Avantone MixCube. In hi-fi terms they are absolutely atrocious, but few other speakers are so revealing of mixing errors.
It is only relatively recently that full-range nearfield monitors have managed to approach the time-domain performance of the NS10 - the Neumann KH310, the Unity Audio Boulder and the Barefoot Sound Micromain achieve that feat, but at vastly greater cost than the faithful old NS10.
If you do not understand why the NS10 is such an iconic and useful piece of equipment, you fundamentally do not understand mixing.