This article really is a pile if garbage.
I dont know who wrote it, but whoever did should think about taking it down. There is so much misinformation in this that I couldnt even count it. Microsoft wont invalidate your windows if it's an OEM key - HOW COULD THEY? KNOWING YOUR IP DOESNT TELL THEM IF YOURE AN OEM OR NOT.
Also not having an activated version of windows DOES NOT slow down security updates. They are rolled out to all windows devices at the exact same time.
And no, it's not illegal to purchase a stolen key as buyer protection states that it is not your fault if you are unaware, but rather the person who's selling it who is at fault. And this is a fact around the entire world.
Whoever wrote this article clearly done no research and attempted to make assumptions and judgments about different aspects of windows 10 and the keys used for it.
It's best, for the sake of your business and its reputation, that you delete this article as to not spread A LOT of misinformation about this topic. And if your writers cant write a simple article about windows 10 accurately, then I sure as hell wouldn't want to see an article written about something more complex.
Absolute embarrassment.