It was a nice article for the time, and a valiant effort to get into the details of the car, but lots of little 'secrets' went over their heads.
These cars were far from standard, and what they were actually looking at was effectively a super lightweight 432-R type bodyshell with an L24 installed. That L24 was far, far from standard (not surprising that the Works team played their cards close to their chest) as it had a different crank, rods, pistons, oil pan, flywheel, clutch, cam, modified E31 head and all sort of other little tricks.
Very deep subject.