Earlier quoted context omitted.
you are being just as rude as the other person, if not more, buddy. There is a much better and constructive way to make this point. Also, the title says that she is "learning to code" so its not unreasonable to say that she probably isn't handling the website stuff... Also, the commenter is making a conjecture about the veracity of OP, not the mother per se.
I am old myself. It is not ability to learn with age that is suspicious it is wanting to share it like this and it would be a clever marketing move. I will learn new things until the day I can't. I am currently learning the Stan language but I am not going to write a medium article "What happens when an old man attempts to learn Stan?"
I bet you could write that article, regardless of programming experience, and tell a compelling story. Different people share different parts of themselves online, and I think that's okay.