Parent is talking about different processes that produce photons: classical acceleration of charged particles vs particle-antiparticle annihilation. You brough

Parent is talking about different processes that produce photons: classical acceleration of charged particles vs particle-antiparticle annihilation. You brought in a fact from general relativity which has no bearing on which processes are more common in the universe. Of course you can always be pedantic and analyze problems at the wrong level. For example, you can say it's all the same QED vertex in the end.