The article makes a few good points but all DLC isn't created equal. There is stuff that has on disc components out of necessity and there is stuff that is entirely on disc just for the sake of greed.
Something the author ignores is that the inherent nature of publishers is to keep pushing for profit and history has shown they will readily do that even to the detriment of consumers. There is a common sense argument that they need to keep consumers happy to keep themselves in business but the reality is that there are more than enough casual consumers in the world to support idiotic practices.
I don't think all DLC is some evil greedy attempt to steal my money but I often find the value proposition a bit iffy and weighted more towards to the publisher. I think there are less than 10 total pieces of DLC that I've found pretty memorable. I think expansions were a better compromise creatively and profit-wise but publishers don't like the risk involved compared to short DLC.