The 43-year-old, also known as Tarik Ibn Ali, is understood to have preached hate-filled sermons at a Paris mosque attended by Bataclan bomber Omar Mostefai.
Mostefai was one of three ISIS gunmen who entered a theatre during a co-ordinated terror attack on Paris in 2015 which killed 130 people.
He was one of six arrested across Europe, four in Majorca and another in Dortmund, Germany since the investigation, which focuses on terrorist material shared online, began in 2015.
Chadlioui, known as Tarik Ibn Ali, was born in Morocco but later moved to Europe where he is said to have formed links with groups including Sharia4Belgium, who aim to impose Sharia law across the country and Europe.
"I have a strong conviction that we should operate according to our values and beliefs."I'm also hugely proud of the fact that we welcome people of all ages over 30.