Hi Eric, we need to access the brood for swarm prevention. Bees like to store their honey above the brood, which means the flow super works better on top. So the short answer is, you need to remove the super.
Cedar filmed a video recently where he performed a split as preventative action against swarming : Live Flow Hive split - with Cedar & Mira
Prevention is better than cure as they say…
Are you willing to experiment for us?