Is the hype intentional?
LA in 1982 had the same hype before the games. Oh, the smog will kill the participants. Congestion on our busy freeways will mean nobody will go to the events which were scattered between Mission Viejo in OC to Lake Casittas north of The Valley.
The reality was no smog and no congestion. People took vacations outside of LA. The air was so good that a reporter asked if LA would want good air every day.
I guess the people who predict such things enjoy the hype. It sells more papers or airtime.
This being August, doesn't all of London leave on vacation?