The article talked about 1983. In 1981, you could get the Cadillac of ASCII terminals, the Ann Arbor Ambassador, for about $1000. In today's terms, you might call that a dumb terminal, but in those days, dumb terminal was an LSI-ADM3A, and Ann Arbor Ambassador was the hacker's choice. The LSI ADM-3 cost about $1000 in 1975.
You also had bitmap terminal options like Bell Labs Blit/Jerq and BBN Bitgraph that had Motorola 68000s but used them as display processors, sort of like an X Window System terminal, but with their own custom windowing systems.
By 1983, Sun, Apple, and dozens of other companies were selling fancier personal computers with UNIX and other OSes based on the Motorola 68000 series and other CPUs, but their cost was more like $10,000-$30,000.