If they are presenting Chaz as having been received from birth as the gender that he currently identifies with, then they are erasing his transness. Based on what has been reported here, they are saying "Cher had a boy", when Cher did not have a baby that was seen at the time as a boy.
I can imagine that they are doing their best to honor the fact that Chaz is now male, but in leaving out the reality of his transition, they are effectively erasing it. I am being as charitable as I can, because the writers are older and this is a relatively new thing for our society, but I don't know what other word we can use when we get down to it. They don't present Chaz as a trans man, but as a man. What would you call that?