Let's pretend that the author of that article is not selling anything and is trying to help you succeed in life. I have nothing against sales, but that author is throwing out a lot of nonsense to sell his stuff and is creating a state of urgency so that people adopt this mindset. It's clever and it obviously works.
From a pure time perspective, most people won't make enough money to run their own business and be as profitable as if they worked for a company. This is a reality that few want to acknowledge. If you invested in yourself and your career with the same discipline and urgency as an entrepreneur, most people would be better off at a company when you consider the benefits and the fact that employees have a full 7.5% of social security paid by their employer (entrepreneurs see the full 15% while employees don't). Why do I start here, because this author isn't telling you that the more people take his advice, the more their earnings will regress to the mean or below. In fact, most of my entrepreneur friends have to go back to work when their reality fails after they burn through their savings.
401ks are not a perfect system, but there are more 401k millionaires now than ever before this, and people who give the author's advice are always looking to avoid doing what they need to do - save for retirement. Most people I know sadly realize this in their 50s, when it's too late, and start trying to "catch up." I don't blame the author for this, as he knows his article will appeal to younger people who don't have the wisdom to see that his advice hasn't been great for most. The reality is that for most people 401ks will provide tax advantaged savings that you can use when you're older; taxes will eat at your earnings, so these accounts really help.
Finally, look at the article again especially the part you quote. He says inflation will carve out what you save, yet inflation is less than 2%. Where is he getting this from? In the past decade, we've seen numerous deflationary spirals and the market overall has come back from the fall in 2009. Again, this isn't "good enough" for this author, so buy his stuff to learn how to succeed! There have been numerous decades (50s,70s) that were much worse for investors than this past one.