Doesn't look like they're blowing the floor to me.
To bend the exhuast 40 degrees, then it shows that the free stream is a much stronger flow.
If this flow is so much stronger why bend another flow in the first place.
Really i have no clue what is going, just putting some thoughts out.
What is suspicious is the shape of the cut. It is a very nasty looking aperture. It almost looks as if they want turn the flow into a sheet of hot air to blow over the beam wing evenly.
So it's either a thin vertical sheet blowing the brake ducts above the brake inlet, or it's a horizontal sheet blowing the beam wing close to the end plate.
they could be even overheating the tyres causing the tyres to degrade rapidly and marble up on the floor. Who know what these guys are up to?