While your statements are correct, it doesn't mean that photons "have gravitational mass". Photons are
massless. They have energy and it is the energy that gravitates. More precisely, the element

of the stress energy tensor represents the contribution of energy to the gravitation, where

is the
energy density. The fact that

gives a lot of people (not only the garden varity cranks) the wrong impression that photons might "have gravitational mass".
The fact that both you and Jilan repeat the same nonsense as Farsight makes it rather disturbing.