If that's true, then that's just horrible. If a policemen who have to view disturbing images due to their duty get a psychological support from the employer, so should the developers of MK. Yes, it's their job, well then it's employer's duty to provide the safest possible environment take care of the workers.
We actually do not know what support the guy was given. We do not know if that person brought up his condition to HR or his boss or anything. Only thing we have is a report of someone developing a condition without any other information. So instead there is a lot of assumptions.