The data on this is mixed, some shows vel. specific adaptations some shows carryover between different speeds. the problem being that they invariably train and test on Isokinetic stuff and there’s no telling how it carries over to real performance.
Just think of it this way: at best increased strength gives you POTENTIAL for increased speed expression. But you gotta do the speed work for it to have a chance of happening. See also other threads about hte role of max. strength is speed activities. Or the fact that many current sprinters aren’t that strong in terms of poundages.
Basically, chasing weights is a mistake. Because you can see all kinds of niftythings and improvements in the weight room and S&C coaches love to talk about their big numbers under the bar. If it doens’t make you perform better, it doesn’t matter unless you’re a weighlifter. Because sprints aren’t determined by who can half squat the most.
Lyle