I said that it might kill some of them. This has happened to me,since the weaker ones would die off,leaving the stronger behind. It seems so when I roused all the yeast back into suspension,& only about half stayed in suspension to start the job again. The dead become food for the living in the yeast world.
And at that temp,fermentation wouldn't start faster necessarilly. Sometimes it might. But on average,it stalls it until conditions improve. Then rousing them will get the job going again. But not necessarilly as well as it would've been. In cases like this,I gave at least an additional week for it to clean up after itself once FG is finally reached. It cleans up at the point where it's setling out clear.