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There might be a legal difference but in common parlance I see them frequently used interchangeably.

A disclosure reveals some previously unknown information, while a disclaimer renounces your responsibility for something.

So your example is correct, although "I am not a lawyer" could also be considered a disclosure.

Disclosure means sharing information that was previously “held close” (private). When people are afraid of being distrusted, they disclose their interests as a show of good faith.

Disclaimer means refusing to accept responsibility for someone else‘a decision to rely on you. When people are afraid of getting sued, they disclaim liability.

This did sound like a disclosure to me as well. A disclaimer would be something like, "Use it. Your mileaage may vary. I am not responsible for any troubles you encounter whilen using it."