Yes, I remember that one. I'm not sure I agree with Batangas though.
Any way, yes the Spanish did forbid points on the blade.
Also a good point Migueldiaz (every pun intended
) about the tang protrusion - it is a Luzon trait.
As far as talibon are concerned, they come from Cebu and that is farther away from the centrally controlled regions around Manila like Batangas, Pampanga, etc. Cebu is farther away from Spanish control and so is Ilocos for that matter (another source of pointed daggers). This is my thinking anyway.