It does seem a bit odd to say "We tested all of these bicycles with the same rider" when one of the test cases is actually a bare high-end frame with no components on it.

It's even weirder given that another of the test cases is essentially "We put parts on the frame (OhMyPi) and it went faster!"

I'm not sure your analogy holds, because here the optimization metric is clear and unanimous: every one wants max pass rate at min costs.

With the bicycle, some may prefer comfort, others speed, others offroad, etc., so it would not be obvious which one is "best".

Not weird or odd in the least. I think it clearly shows that Pi barebones at least in this set of tests, preformed better and cheaper cost that OMP.