ZIRP or no ZIRP, technical people are more respected now and are more often decision makers. I think irrespective of market dynamics, it's more common now for a CTO to be an ex-developer and not just someone who knows how to manage budgets.
This means that any technical product still needs to work on presentation in a non-superficial way. You can't just have copywriters writing "X is the best platform. It's so good. It will solve all your problems", and make sales based on that. You also need great getting started docs, migration docs, explanations and guides. Even before people are actively using those things, they are looking at them and evaluating them to decide whether to buy into your product/platform or your competitor's.
[Disclaimer, I own Ritza a company that offers this as a service, so probably I am biased, but we are seeing pretty strong demand still. So I agree with the article that a lot of the 'do it because everyone else is doing it' parts of DevRel are probably dead, but the need for people who operate at the intersection of tech/sales/marketing is well established now and will exist in some form as long as there are technical companies selling technical products).