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It's not just the engine needing break-in, but the rear diff and other components too. They'd have to run the car on rollers for 20 hours.
During a Spartanburg factory tour, I watched them run most if not all cars thru a 3-5 minute simulator on rollers. A driver follows a script to warm the motor for a bit, get it up to 80 mph for a minute or two, and coast back down. If I recall correctly. More a confidence test in the components than a break-in.
My personal opinion has been to baby it and vary RPMs the first 100 miles. Drive it normally with a few moderate acceleration runs up to 500 miles or so (still no long periods on cruise), and gradually begin to occasionally run it hard but not full throttle 1st or second, up to the 1200 mile point. I may exceed 5k RPM in that period but not to redline (and always when warmed up).
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2020 X3M non-comp, Alpine White over black : Exec Pkg, ventilated M Sport seats, 20"s
2020 M2 Comp, Sunset Orange/Blk: Orange stitching, DCT, exec pkg, bicolor rims
Gone '18 M550i, '16 X4 M40i, '15 M5, '13 X3 35i, '12 335is, '11 X5 50i, '09 Z4 35i, '08 550i, 06 X3, 06 650i, '02 M5, '99 540i
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