So what? Is the motivation of a swimmer in 2nd place in a non-Olympic event comparable? Is the motivation of a swimmer who wants to work toward the Olympics comparable? Is the motivation of a swimmer trying out for the Olympics comparable?
Every Olympic athlete, with the possible exception of the Jamaican bobsled team, has been equally motivated at dozens or hundreds of officially-measured points in the recent past. Why do we expect personal records at the Olympics?
Well, for one thing, world records don't get ratified in a local pool.
And athletes are competent enough to achieve the time needed for qualification without going all-out. Look at the finish times of the heats. Pan Zhanle was over a second slower.
Every Olympic athlete, with the possible exception of the Jamaican bobsled team, has been equally motivated at dozens or hundreds of officially-measured points in the recent past. Why do we expect personal records at the Olympics?