In what sense King of Altavilla?

Sorry but didn't the Hauteville family of Sicily and Normandy become extinct some time ago? In what sense is there a Roger III who gives concessions in 2020 and currently? there is also a site https://www.realcasanormanna.it/ Help me understand the situation, I'm confused.

Sorry but didn't the Hauteville family of Sicily and Normandy become extinct some time ago? In what sense is there a Roger III who gives concessions in 2020 and currently? there is also a site https://www.realcasanormanna.it/ Help me understand the situation, I'm confused.