A lot of places have combined that work into same stack/JS and call it "frontend".
In my case, a back-end team of 4 owned everything "non-app" while about 10 engineers owned the various front-ends.
DevOps is a mindset of bridging operational and development teams to improve the delivery of work done to a place where it can deliver value.
If the author means an “SRE”, he should say that - though the discussion about “you write it, you run it” can be left for a different day.
I don't agree with any of that, but that's how the cookie has crumbled.
By my count all the non-front end devs do back end, so Client Applications (2), Core Services/Platform (1) & Dev Ops/Infra (1)
but then having vc money contributes to decisions most of us, will never understand.