Unreasonable effectiveness of [blah] has been a thing for decades if not centuries. It's not new.
Wigner's essay is about how the success of mathematics in being applied to physics, sometimes years after the maths and very unexpectedly, is philosophically troubling - it is unreasonably effective. Whereas this blog post is about how LLM agents with tools are "good". So it was not just a catchy title, although yes, maybe it is now beibg reduced to that.