I doubt they are publishing the real story, there. What is a fact is that Mr. Preston-Werner is resigning. From there, we may only speculate.
If I may speculate, I'd guess that there was some truth to the story told by "the other side", that there was some kind of harassment on the part of this man's wife (who was not employed there). That is all I can really guess. And the only real way to publicly resolve this would be for this man to resign - while he perhaps didn't personally do anything wrong, maybe his wife did, so he was in a sense the fall guy for that.
If I may speculate, I'd guess that there was some truth to the story told by "the other side", that there was some kind of harassment on the part of this man's wife (who was not employed there). That is all I can really guess. And the only real way to publicly resolve this would be for this man to resign - while he perhaps didn't personally do anything wrong, maybe his wife did, so he was in a sense the fall guy for that.