That is incorrect there was no "placebo-effect buffs" in conscripts in the "DECEMBER 19th" patch.
The DPS of the squad was increased.
The mosin become:
a) more consistent in its damage out put
b) It had its DPS increased
The DPS was changed.
Yeah, by 0.1-0.5 around at mid-close ranges. It's a joke and Conscripts lost ability to snap off models at close range due to 16 damage becoming > 12 making them actually worse at close ranges.
It was never meant to be buff in any meaningful way, in fact inrease of munitions of basic abilities and PPSh upgrade ended up making Cons borderline worse than they were before "buff"