I mostly skimmed through the video, but I think the gist of it is this:
1) Do a fluid sim in the room with no furniture.
2) Setup a tyFlow to advect particles through the first sim. Set them as kinematic PhysX rigidbodies and set the furniture to dynamic PhysX rigidbodies. When the kinematic fluid particles get close enough to the furniture, turn them to dynamic so the interactions with the furniture is 2-way. When they move too far away, turn them back to kinematic. This will improve performance since only a small portion of the total fluid particles will be dynamic, even though they'll all be advected by the fluid sim the whole time (I haven't tested this myself but this seems potentially very clever).
3) Do a second fluid sim with the previously-simulated furniture particles, so that the fluid interacts with the new motion of the furniture.
1) Do a fluid sim in the room with no furniture.
2) Setup a tyFlow to advect particles through the first sim. Set them as kinematic PhysX rigidbodies and set the furniture to dynamic PhysX rigidbodies. When the kinematic fluid particles get close enough to the furniture, turn them to dynamic so the interactions with the furniture is 2-way. When they move too far away, turn them back to kinematic. This will improve performance since only a small portion of the total fluid particles will be dynamic, even though they'll all be advected by the fluid sim the whole time (I haven't tested this myself but this seems potentially very clever).
3) Do a second fluid sim with the previously-simulated furniture particles, so that the fluid interacts with the new motion of the furniture.