>I'm not sure what the author of the rant thinks the people who invented Unix were doing all those years.

I'm not sure what you think they're doing, but they were not running Unix in production.

I've read an interview with Ken Thompson taken around the nineties, and he mentioned they were using Windows desktop machines. And true to the words he had Windows on the monitor on his desk.

And of course they were doing academic and researchy stuff. Not running Unix in production.