They're not Jumbotrons -- they are South Dakota-made Daktronics ProStar units. The Brookings, SD manufacturer has the contract by Swatch to provide all video boards.
But officials at FINA cannot use the spectator-friendly ProStar units. They must officiate from their poolside points, and cannot use replay cameras.
Thank you for correcting me on the exact make and model of the BIG TV's up there that everyone can see. I realize the officials aren't using them, that spectators were reacting to to what they saw.
Did you check my post for grammar and spelling, too?