This essay completely misunderstands how the notion of emergence gained prominence and how people tend to actually use it. It's a straw man that itself devolves into a circular argument "embrace a reductionist epistemology because you should embrace a reductionist epistemology".

It doesn't even meaningfully engage with the historical literature that established the term, etc. If you want to actually understand why the term gained prominence, check out the work of Edgar Morin.