That's a somewhat misleading response. It isn't mentioned in the linked article, "Weird and Innovative Chips", but in an entirely different section called "Unix and RISC, A New Hope".

The linked "article" is one chapter in a bigger work, and they only put chips in one section even if they could be in two. It has an article in the greater work as this is one chapter and shouldn't really be read in isolation as the rest of the work references chips in different sections.