They use a service or API for it I believe.
Unlike primal and ditto which both allow this kind of stuff
https://primal.net/p/nprofile1qqsx97pw3as2pqulhghs4vkxzwqdr6p0wvjzggax0uegn74mae5ww8qv7xkpd
https://primal.net/p/nprofile1qqsx97pw3as2pqulhghs4vkxzwqdr6p0wvjzggax0uegn74mae5ww8qv7xkpd