Exact same situation happened on Vindictus EU. Our Community Manager - Belsazar, also after many promises simply left us. He made similar farewell post, talking about nostalgia, a new life path, etc.
Shortly after, we found out he left to the other game company; to a "bigger" upcoming game, which was BDO.
Toxicity of community was probably one of reasons why he wanted leave and I belive similar situation is with Jonathan.
But toxic people are everywhere and there will be always people who will complain (regardless if for good or bad reason).
I don't saying gam