Hmm? Lok hasn't done anything to suggest he is completely omniscient. He is only 'nigh' omniscient. He knows a lot and can know a lot, but not everything. Like Vowzra for instance, who knows a limited amount of futures, but not all of them (Escre took him by surprise twice).
If others have misinterpreted Arguis' omniscience then that is a separate issue.

But on that point, do you have any specific things Arguis has done or said which would imply he is OP or straying beyond his power?