Canada: Arrest of ex-head of intelligence shocks experts and alarms allies

>The charges show that Ortis is accused of communicating covert operational information in 2015. He also faces charges of sharing secret information with a terrorist group or foreign entity – but it remains unclear if he had interacted with a state or individual.

IANAL, but why was he not charged with 'treason'? I think there is obviously a lot of nuance to what he allegedly did, considering his actions haven't been labelled as treasonous.