The purpose of a system is what it does.
— Stafford Beer
— Stafford Beer
Systems are self-perpetuating entities that exist independently of the purpose one person or another places on it, and all the different people inside and outside of it all place different purposes.
That phrase the article is complaining about means that talking about a system purpose is meaningless babble. Only people know about purpose, systems don't.
The fact that the article's author spends the entire time reacting to random people on Twitter instead of going after the author, and even dismisses the one person pointing to the original meaning with a no-answer doesn't make anything better.