I may be talking shit, but for what I understand of SE, it wouldn't make sense to loose the data if you reinstall macOS.
I tried to look up the info, but the only thing I found was this: "But because its backing storage is physically part of the Secure Enclave, you can never inspect the key’s data."
That means that it get stored in SE instead of your computer's hard drive.
Also, Apple have instructions to clean Secure Enclave if you're going to sell your macbook pro with touchid.