MRSA is unfortunately not exactly rare:

Studies show that about one in three (33%) people carry S. aureus bacteria in their nose, usually without any illness. About two in every 100 people carry MRSA. Although many people carry MRSA bacteria in their nose, most do not develop serious MRSA infections.

(emphasis mine)

It's commonly acquired in a healthcare setting, so if I were an evil corporation intent on murder and knew my target was in the hospital for whatever, I'd bribe a criminally underpaid nurse's aide to cross-contaminate.

Idk if he was in the hospital for anything, the article doesn't specify if he was sick before the pneumonia-plus-MRSA happened. I guess someone could blow MRSA dust in his face 🤷

idk, just wild speculation about what is technically possible, not what's likely