I've seen some great efforts by people on inferior equipment, some amazing, but the winner at any given race of substance is usually aboard the appropriate tool for the job.
For anything but cruising fireroads - and if you look at his background, that would be the guy's stock in trade - the article is dealing in pure fantasy, even when talking about early 90s equipment.
I grant that you can get up, down, around and over anything on pretty much any mechanically sound bicycle, however the quotient of extreme low speed or even getting off and walking will be greater the further from appropriate your ride of choice is.
Once I'm finished building my LTS up I'll try and back-to-back test it with a Force (IMO its a pretty accurate comparo). My feeling says the difference will be night and day.