While not exactly the same, I think the suppression fire rule is redundant.
The reaction mechanism in the core book already covers a similar penalty. Each reaction inflicts -1 DM. Someone auto-firing at their target will most likely inflict sufficient -DM to make their target fail their round. i.e. Auto 4 = -4 DM, considering the target reacts. The 2nd edition also added the "dive for cover" which grants the cover DM, and the armor of the cover (if Ref allows).
In effect, both resolutions result in the target being suppressed. It somewhat matches this wiki: https://en.wikipedia.org/wiki/Suppressive_fire, but (thankfully) I have been in real-life firefights, thus I have no idea how accurate is that.