Officially the Crimson Corsair wears a Kaleesh mask, it does not look like one. It much more resembles Durges helmet. Maybe it´s a Gen'Dai mask and he got both species confused, since
Approved Tech - Kaleesh warrior mask | Star Wars RP
Free STL file Bone Mask・3D print design to download・Cults
Some variations of a new kaleesh mask that I made for a friend and their OC : r/StarWars
SW "The Old Republic" Kaleesh Mask by Jace1969 | Download free STL model | Printables.com
Kaleesh | Wookieepedia | Fandom
Kaleesh at Star Wars: Battlefront II (2017) Nexus - Mods and community