A continuum is not isomorphic to a single point.
The objection in the article is specifically about offloading thinking to technology, which is something we've been doing for decades, or depending on your definition, since we first started using tools.
If offloading cognitive labor is the core problem, then what makes AI fundamentally different from the countless other technological advances that have allowed us to offload cognitive labor?
Computers and computer programs are much more like heaps than integral wholes. There is no essential difference between what we conventionally call "AI" and any other computer program. The manner in which we have cordoned off "AI" from "non-AI" has more to do with human purposes and perspectives rather than any objective facts on the ground.