Assuming you are referring to the Steelcase Leap v2 Chair, in short, yes it is good for people 5'4" and under. Here's why:
The Leap v2 was designed with ergonomics in mind and features a seat depth adjustment that allows the user to customize the fit to their own body size. This is particularly important for people who are shorter in stature, as they often have trouble finding chairs that fit them properly.
In addition, the chair's backrest is adjustable both in terms of height and angle, so that users of all sizes can find a comfortable position. The armrests are also adjustable, which further enhances comfort and support. Overall, the Leap v2 provides a high degree of adjustability that makes it suitable for use by people of all different heights, including those who are 5'4" or shorter.