It does work. If you run the game in Debug mode, you'll see that IsSprinting is changing to 1. And the animation runs faster.
The 8direction maximum speed doesn't change probably because it's set to 250 again in event #39 or somewhere else in the code.
By the way, you don't have to disable "PlayerStamina>SprintVal" condition, I forgot to re-enable it before making the screenshot.