The attached scan is from the September 1982 issue of popular mechanics.
It says " Most people don't know that the "all new" Chevrolet s-10 is actually an Isuzu Pup with a different body. Even the S-10's standard 1.9Liter engine is built in Japan."
But after doing some research on the net, http://www.edmunds.com/chevrolet/colorado/history.html
I believe you are correct and that popular mechanics were wrong.
Maybe pop mech were mixed up because the Chevy Luv pickup was an imported Isuzu pickup?
Anyway, thanks for the correction.