The article argues that Dev-Owned testing isn't wrong but all the arguments it presents support that it is.

I always understood shift-left as doing more tests earlier. That is pretty uncontroversial and where the article is still on the right track. It derails at the moment it equates shift-left with dev-owned testing - a common mistake.

You can have quality owned by QA specialists in every development cycle and it is something that consistently works.