I have no idea what the author's point was, unless it was that products today aren't as good as they used to be. Duh. The example of stainless steel from China corroding indicates that the author is unaware of the existence of different grades of stainless steel, and that some grades will indeed rust over time. It's always been that way.
This was my takeaway from the article/conversation. Few consumers set out to "get less than what they pay for", and for any given consumer product it is (I presume) an even smaller fraction of consumers who would be capable of formally describing
what it is they are specifically getting for the price they are willing to pay. "Stainless steel cutlery" is a market that is reasonably well-known for having a wide spectrum of raw materials, and also marketing (hype, promises, fraud).
I think that the article was a bit disingenuous (or at least simplistic) about the link between physical materials and "planned obsolescence"
especially with stainless steel products, for the exact reason mentioned by
@Jim Wynne . Knives and metallurgy are a pretty old technologies, as is cost-cutting and over-promising.