Sadly, it is a slur and since you can't remember where, when etc I think it best removed from the article. Back it up and I'll happily see it remain.
I have worked in the PR office for Rover, Peugeot, BMW and Toyota and I can tell you the Toyotas are by a long way the most standard test cars I have ever seen. Rover practically rebuilt every car, including paint, Peugeot used to get a race shop to build the engines of the GTis, BMW have a code that means cars destined to be given to the press are made with parts matched with top 10% tolerance and Ford sent cars for the Car of the year Jury in France with special labels on the dampers.
Toyota, we get them of the boat, clean 'em, put a few hundred miles on to loosen them up if we're lucky and hand them out. The Corolla that won What Car?'s car of the year came off the line less than 24 hours before they had it to meet the print deadline.
Scott