This has already be debunked https://www.threads.net/t/CuXRXDdNOtH/ You can "deactivate" your account and delete all of your posts individually, which is effectively equivalent to deleting your Threads account.
From a practical sense it isn't equivelant either, because if I want to reduce my risk of being affected by a Threads data breach, totally valid reason to delete an account you don't use, then my data would need to be removed entirely.