In march this year there was a change to how knockback works. it made all knockbacks consistent and similar regardless of the enemy’s movement leading up to the knockback. D.Va booster knockback isn’t part of this knockback change.

Here is the video showcasing the difference in consistency for D.VA boosters and other knockbacks which are not affected by orisa or dva shooting. These two heroes have different movement speed when shooting, both were pretty much impossible to boop in the old patch.

https:// streamable . com/cnhlv

Same issue is with knockback to the mercy when she is resurrecting, dva using boosters and many others, which is not showcased in the video.