stackskipton makes a good point about authority. SRE works at Google because SREs can block launches and demand fixes. Without that organizational power, you're just an on-call engineer who also writes tooling.
The article's premise (AI makes code cheap, so operations becomes the differentiator) has some truth to it. But I'd frame it differently: the bottleneck was never really "writing code." It was understanding what to build and keeping it running. AI helps with one of those. Maybe.