Dr Mehmet does his best to supervise and encourage a huge writing and editing team. He cannot agree with everything he posts. What editor does?
Putting up a post that will generate discussion is good for a publication. I am quite sure that the comments section would have reflected the community disapproval.
As for "gay conversion therapy" or whatever, it really can only have two outcomes:
1. The target learns to go back in the closet and be very careful about their activities, or
2. They contemplate a lifetime of frustration and unhappiness and decide that an early exit is a better choice.
One of the greatest joys of my recent years has been seeing tolerance open up within the community and officially. A friend of mine has a passport which recognises their non-binary status, and they are the very picture of happiness, especially after the surgery. Their only problem is that those who have known them for a long time keep on using the old pronouns and then apologising a minute or so later!
And do you remember when the White House was lit up in a rainbow? What better signal to send.
I think James has acted unwisely, out of stress and unhappiness, maybe. Asking Medium to investigate the incident may not have been the best choice, and there may be a boomerang effect there.