If you mock up AirTag broadcasts using one and only one of those messages as a public key, and you send it many times to improve its chance of getting through,

If you mock up AirTag broadcasts using one and only one of those messages as a public key, and you send it many times to improve its chance of getting through, I can figure out which hidden message you sent by working out the SHA256 hashes of all possible 100 messages… Would this be the equivalent of using a one time pad?