Writer didn’t do enough research! Studebaker used Chevy engines the last couple years they were in production (65 and 66 models), after they moved to Canada. Checker Motors used Chevrolet engines for many years in their taxis and civilian models (65-82). Of course Checker never made their own engines, using Continentals before Chevies.
Then he went and mentioned some overseas models. AMC Hornets used Chevy sixes in 72-74 in South Africa, where Toyota also used them in trucks, I believe. This was right before US car makers left the SA market, partly in protest to Apartheid, but tariff regulations made it hard to produce cars in SA at a profit and very expensive to export to SA. Parts were tariffed by weight, so AMC, GM, and Toyota entered into some lucrative parts/manufacturing sharing deals. I’m doing this from memory… Toyota may have been making some GM engine parts rather than using GM engines… may have done both. IIRC Toyota and GM had foundry capacity in SA at the time (according to some SA auto magazine articles from the early 70s).