Well, that has the ring of truth, when applied to the newsfeed. And the final conclusion that you should just get on linkedin when job searching and then get off again is fine. I find it incredibly useful for job searching, to the point that I don't even bother with other sites.
However, the job search experience is badly spoiled by secondary recruitment postings. These are especially annoying when the posting is cut off so that you have to follow an external link to get the full info. And having to apply from external sites is also a pain. Linkedin seems big enough to be able to enforce some rules on those sorts of things.
I think the newsfeed stuff that this article focusses on really only affects people who buy into it. Personally, after reading a few posts of the type '5 reasons your boss should stop doing that thing you hate', I stopped paying attention to the newsfeed unless there was a robot video from boston dynamics at the top. And the secondary features don't really seem like they have enough meat to stick.