Weird, there's no paywall when I go to the site. In any case, here's a paragraph that gives you the reason:

"Here’s my hypothesis, stated plainly: Google DeepMind CEO Demis Hassabis—a pioneer of AI as we understand it today—doesn’t think that automating AI research with coding agents (AI systems that can program better AI systems) is the correct approach to artificial general intelligence (AGI, the kind of AI that’s as good as humans at everything). Google DeepMind’s leadership sees OpenAI and Anthropic’s bet at best as an off-ramp, and at worst as a dead end."