You should look up what the word "fraud" means in a legal context.

You would have an incredibly, overwhelmingly difficult tike attempting to prove that in court at this moment.

Fraud requires intentional deception and requires you to have lost something. This is a proactive action to prevent misunderstanding and from you purchasing something that won't work, and refunds your purchase. The loss, and the intent, are both missing.

This is categorically not fraud.