I would say it all depends on the reach. If a company publishes 10 posts a day, without promoting them, then I would think that only a few of the fans will get more than 2 or 3 of the posts that day (if we're to go with the 10%-20% estimate in the article).

Now if you were to promote all those 10 posts, and 99% of your fans would see them all, then most will get annoyed. And if they don't get annoyed within the first day, they will get annoyed soon enough,