It
is bewildering, but as I've mentioned before, the information that the conflict revolved around the sacrifices essentially came from Emet-Selch.
Nothing we saw from Venat herself or her faction, directly, indicates any concern about the sacrifices - if anything it
contradicts it, given that Venat still thinks opposing the Convocation makes no sense to her once we relay our full understanding of events, including the sacrifices - but putting aside the very muddled and confused intent of the writers, and whatever may have changed between 5.0 and 6.0, what emerges from the text as is now is that... Emet-Selch probably misunderstood the source of the conflict. Maybe he was projecting!