Aven Liberator was not "turned face up". The old Aven Liberator permanent was face-down while on the battlefield when it was exiled, then a new Aven Liberator permanent entered the battlefield face up from exile.
It needs to change from face down to face up while staying on the battlefield or the ability won't trigger.
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It needs to change from face down to face up while staying on the battlefield or the ability won't trigger.