I was glad to see someone at least attempt a motorcycle reliability study.
I would also say I wasn't surprised by the results. German cars often score poorly.
Having owned a Road King, the only reliability problem I had was caused by the tank vent system. The hose barb for the vent was braised to the tank,, but no hole in the skin of the tank.
My current BMW suffered a fuel strip failure, and that's it so far.
Even though BMW and HD might be at the bottom, they still seem to be remarkably reliable. HD has a robust feel and character that Japan can't seem to capture. The BMW has excellent handling, IMHO excellent suspension, and again character that Japan makers haven't been able to duplicate.
Don't get me wrong, I don't have anything against the brands from Japan, and I've owned Hondas and Suzukis that were excellent.
Anyway: With any luck, this might prod BMW and HD to look at what fails and make improvements.