Honestly, I didn't even read the article, beyond the essential point that USA mogas is an average of two octane rating methods vs avgas using one of them. Looks like it was basically a commercial for their octane measuring gadget.
I never worry about mogas contamination from the pump, other than checking each batch I buy for alcohol before using it in the plane. I *do* use a water/trash separating funnel when fueling the plane, because I do worry about my own sloppy handling. I can get 93 mon/ron E-free mogas in my area, and I've never had an issue running fresh summer blend in an 8.5-1 compression Lyc. (Winter blend in 100*F summer heat is a story for another day...)