That's not true. Hobbyist registration is for the operator only and is in no way ties to a craft. Maybe paper registration for commercial entities has this extra info but not the hobbyist registrar. Source: I've already registered and the information you state they require is not required.The registration number will be posted on the website, and the FAA will have your serial number to identify your UAS, and yes, your serial number, type aircraft,name, address and email will be posted.
Post edit: email is not posted.