John Farley -
I've noticed another anomaly or two (and I'm sure there are more) in that table. The NAA T-28, as I recall, had a concave lower surface at the tip, such as you mentioned on the PA-44. (Many aftermarket STOL kits do likewise, and Pilot DAR tells me the Basler kit for the DC-3 does the same thing.)
Yet the table shows the T-28 w/both root and tip with the NACA 64A215 airfoil, and the coordinates I found for 64A215 show no such concave lower surface.
So I suspect some refinement of the table is in order. For another item, the Howard cabin aircraft DGA-8 thru DGA-15 airfoil is a reflexed airfoil properly identified as 2R212 with the middle "2" a subscript. The plain text table has no means of showing the subscript.