I had to give up my fingerprints to maintain a drivers license, but that doesn't get me TSA Pre.
So far, searches haven't turned up authoritative information (on a current, relevant federal or state sites) on Real ID requiring any biometrics. I believe it, I just haven't found an official source confirming it.
https://www.dmv.ca.gov/portal/vehicle-industry-services/occu...
It's in there a few times.