I'll agree, very poor journalistic skills in this article.

That being said, in a small percentage of MS patients, psychosis can be caused by the disease or some meds used in the disease treatment. It makes me wonder if that was the case with this man.

Google psychosis and multiple sclerosis and you should come up with the numbers of those whose MS can lead to dementia or psychosis. You can also google psychosis and Betaseron and it's listed as a side effect.

So although the journalist does a poor job of defining this man's situation, it could be his MS or the Beta that caused it.