That's my point. This doesn't sound at all far fetched if you've spent time with people recovering from psychosis with visual hallucinations.
I'm normally a very skeptical person, and while I both agree claims require evidence. I don't find the comment thread from before very compelling evidence.
Fake or not, I do believe that an ad with the text from the troll image would show up on a smart fridge, I don't trust Samsung to tell the truth^1, and importantly the minimal description from the linked post describes an experience similar to one I've seen before working with a patient. (But from a print ad.)
Even if this exac is fiction, this kinda stuff actually happens. Perhaps I'm wrong, to believe it's plausible, but dismissing it outright is a mistake. You don't want to acknowledge hallucinations are real, but more important than that, you don't want to tell someone that they're lying without positive proof.
edit ^1: I read that exactly prior to reading your reply, and yes I do agree that explanation seems to be correct; that wasn't what I was basing my take on. i.e. true or not it's less important to my original objection. Or I find it plausible than even a small advert would result in the same event.