Like I said, it's not about accuracy. Something outside of AttribArchive has changed in regards to suppression.
I'm probably crazy but if what your saying is the messed with the game engine they might have adjusted how accuracy works in relation to suppression because:
Game Data Organization Effort
Previously when we increased the lethality of infantry it was done with a blanket modifier of weapon accuracy and received accuracy. What we have done is adjusted the data so that the actual weapon stats are relative to its lethality. The performance of the unit and weapons are not changed. This is simply a data cleanup effort.
Removed accuracy weapon and receive accuracy modifiers that was used to increase infantry lethality and create a class type. Move respective values into the accuracy of the weapons and the size of the unit.
+
All HMGs
We felt blob counter units weren’t performing as well as we wanted and needed a performance boost to deal with Blobs of units better.
Incremental accuracy multiplier changed to 1.15
Incremental search radius changed to 10/12.5/15
Nearby suppression radius changed to 13 (except maxim HMG)
Min / Max Bursts unified
Tells me they might have tied suppression more to accuracy now, because if accuracy didn't affect suppression why did they make incremental accuracy a thing for HMG's?