Your contact information is protected at the registration of your domain name.
When you register a domain name you need to provide an email, a physical address, a phone number, and other personal information. All this information was public before the GDPR implementation.
Due to GDPR implementation, the registrant's contact information is redacted in the public Whois and shows placeholder data to protect your privacy.
Managing the contacts of your domain name
Could my contact information be public?