Docker isn’t all container technology. It wasn’t the first, isn’t the best and is not synonymous with the concept.

The article goes on to elaborate on that statement, claiming that Docker as a container runtime is going to get elbowed out of the market by faster, safer, more feature-rich container runtimes.

It's funny that you quote that, because your OP genuinely felt like that was as far into the article as you got. He is no way is saying that containers are dying, quite the opposite, but he thinks that Docker itself is going to lose relevance in the container ecosystem.

Docker the technology is not all containers. In fact, these days, it's a wrapper interface again.