They're for the huge drop down tifo's I think.
The TIFO Banners are proposed to be hung in 3 filleted segments to accommodate the curve of the bowl, allowing for a triptych display. The banner will be hung from 3m beams at the edge of the bowl roof, to be coordinated by the structural engineers. The banners need fall in front of the seating tier to ensure spectator safety. The location of the banners will not adversely impact upon the structural design of the roof and will contribute positively to the match day experience of the supporters.
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Conveniently also gives them ledges that don't need finished to fix temporary protective barriers to, leaving easier access to finish the edging of the cladding that needs flashed.

