Upvote:6
The site around Troy was not continuously inhabited. Troy VII, what we believe is the one associated with the famous Bronze Age Troy, was deserted in the mid-10th century BC, followed by the establishment of Troy VIII around 700 BC. That's plenty of time for people to forget about what happened before. The inhabitants may not be the same people either, which means oral traditions may be lost. The legend only survived in Ancient Greece, after all.