I'm probably going to come off a little harsh here.....
But I'm fairly certain that the Xenia weren't involved in the poisoning, I bet there were also some palys on that rock somewhere. This article while pointing out some very important information, was obviously written by someone who has no idea what they are talking about.
This guy pretty much has no excuse for what happened, he claims that he already knew about palytoxin... and "The engineer, who has kept largely tropical fish for around 12 years, said he was 'no amateur' and had thought he was aware of the dangers."
Keeping tropical fish for 12 years has nothing to do with whether or not he is an amateur.... just go to any of the marine aquarium Facebook groups (Addictive Reef Keeping is a good place to start) and you will find people who claim that they have been keeping fish for 20 years, but don't understand the basics of the nitrogen cycle, or proper quarantine processes, etc.
This hobby already has a black eye because of people like Snorkel Bob, Rene Umberger and For the Fishes, we don't need hobbyists doing stupid things and then ending up in the news.
The warning and info about Palytoxin has been out in the public for years, and if you haven't accidentally stumbled upon it, you probably shouldn't be involved in "the hobby" because you aren't doing your due diligence in learning to care for your tank and making sure it is safe.
*steps down from soapbox*