It's a scam text message. But your grandma can't tell the difference. It just illustrates that Apple is not a silver bullet. In the end, there is no substitute for education.
Have you considered writing your comments in a way that makes it clear what you actually mean? Because your top level comment, which I take to understand was written from the point of view of this grandma, lacked the context to make this discernible until you had to write this explanation.