Ya I’ve seen this too with high schoolers in my school and other schools. Realistically, their lifting improvements will cause more acceleration improvements vs. top speed, and thus their 40 times will be able to drop.
I took my squat up a lot, as well as other lifts, and noticed my first 30 felt blazing fast. I’d done some running, nothing too much. However as soon as I got fully upright, I felt like i was in slow motion.
Now fast forward 2-3 months, where I’d done some good speed work, and squat numbers hadnt improved much, and my acceleration was the same, but top speed was much much faster ofc.