A misleading description, aimed at the non questioning layman. Here some quotes:
This is how all objects are affected by gravitation in General Relativity, not only photons. All free falling particles follow geodesics in curved space-time and experience the same coordinate acceleration, which is independent of their own mass.We also knew that photons are affected by gravitational fields not because photons have mass, but because gravitational fields (in particular, strong gravitational fields) change the shape of space-time.
A completely meaningless distinction. The geometry of space-time and gravitational field are the same thing in General Relativity.The photons are responding to the curvature in space-time, not directly to the gravitational field.