I don't know this guy, so I can't speak for him in particular. But, in general, I wouldn't be surprised if the opposite was true: too many so-called software developers give "shipping" too much importance, leaving none for any other aspect of the job. Shipping is a feature, not the feature.
Back in those days, there was a backlash against "big design up front", and very little respect (in general) for testing as a practice. Unit testing in it's modern form was reasonably rare.
After this Agile/TDD stuff caught on, many people ended up over-testing things. This is a pretty typical thing to do when you're learning about how much testing is sufficient. I've definitely done a good amount of this myself.
It can take a good deal of experience to know where to draw the testing lines in particular contexts. I think this blog post points at this specifically - that we should write high-value tests, and just enough of them. We also use feedback over the long-term to have heuristics of where we tend to have recurrent issues, so we can test a bit more in those areas.
Far from being focussed on "only shipping", he's underlining the fact that "just enough well-written tests" support working software - and that should be our focus, instead of thinking our job is to "write more tests" (or focus on test coverage, etc).
This is not some random guy, he is like the "father" of TDD. And that is why the guy that wrote the article thought it noteworthy to mention his quote.
If it came from someone else it would not be that important to make such a fuss about it. But when it comes from Kent Beck then it is worthy at least some discussion.
Literally the second sentence in the article.
> Kent Beck, respected authority, creator of Extreme Programming, TDD and writter of several great reference books, mainly at the great Addison-Wesley edition