She lists the main factors influencing infiltration as sand, loam (rather than silt), and clay. Do you think this is an intentional simplification/dumbing down? Axe later refers to these same 3 from his high school ag classes. Do various parts of the country and world use another model vs the traditional soil triangle?
I find that people describe or specify loam as though it is a specific material rather than a term encompassing a range of combinations of sand, silt, and clay. Always reminds me of someone who would order 'the fish' in a restaurant, ignoring that the choices are perch, salmon, and sea bass. The fish stew would contain, within constraints, some of each of the 3 fish.
Overall I think that extension piece is a good quick overview on things that influence water infiltration but am unclear on her intent.