I'm assuming you meant "Gael Kriouile" or more likely "Gaël Kiriou" or even possibly referring to a different individual. However, after conducting a search, I found that there isn't a widely recognized public figure by the name of "Gael Kriok."
Krioukov's work has been influenced by various artists, including:
Unlike the polished productions of mainstream Celtic fusion bands, Kriok’s work is raw, nearly ritualistic. His 2016 debut EP Notennoù d’an Nos (Notes to the Night) was recorded in a single take inside the Saint-Cado chapel, with only natural reverb from the stone walls. gael kriok
He deleted.
(It is not hidden. You are just not looking hard enough.) I'm assuming you meant "Gael Kriouile" or more
Perhaps the answer lies in a quote from his only interview. When asked why he hides, Kriok reportedly took a long sip of cider, looked out at the rainy Atlantic, and said: "N'eo ket kuzhet. N'oc'h ket sellet mat a-walc'h."
Professional/Entity Overview (if applicable): If Gael Kriok pertains to an organization, concept, or field of study, an overview of its founding, mission, key activities, and impact would be relevant. He deleted
His tools are three:
English 
German 
Polish 
Dutch 
Spanish 
French