As reported in discuss mailing list, "the link to the storage bucket (https://console.cloud.google.com/storage/browser/m-lab_revtr) provided in https://www.measurementlab.net/data/ seems to be invalid."
This is because the location access policy changed without us being able to prevent it and the Reverse Traceroute team has not finished their effort to upload their data to a new third-party GCS bucket that would be publicly accessible.