The methods described might be new, but the underlying principle is simple and fundamental - charge customers based on their willingness-to-pay. If customers are willing to pay $10 for your product, as opposed to $20, almost all businesses would take that into account when setting their prices.
In a low-tech world, you can only price stuff using one-size-fits-all. So you would price stuff based on something like median-willingness-to-pay. This puts your product out-of-reach for half its potential customers, while giving a big discount to the other half. The techniques described in the article are designed to "fix" the above - sell the product to as many people as possible, and give everyone a more even discount compared to their willingness-to-pay.
There is no reason for this strategy to stop working just because other companies are also doing it. In fact, it will only snowball once this practice becomes more commonly accepted.
In a macro sense, fine-grain-price-differentiation is undoubtedly in the best interests of all corporations. Whether they are in the best interests of consumers is more debatable. I'm guessing the answer is no. In theory, the best possible outcome is perfect price differentiation, coupled with increased corporate tax rates (or capital gains tax rates) that are used to lower income tax rates. I doubt this will happen anytime soon.