Have you also noted that the multiplier behind the "faster cooldown" says x 1.02 (effectively increasing the cooldown by 2% instead of decreasing). A similar thing happens with the KV1 bulletin which says "4% increased defense", while there is no string attached to it (effectively doing nothing).
Intel bulletins have been discussed quit a lot, but Relic hasnt changed them in years.
You can see the cooldown time delays that belong to M1 Carbine below. The average delay for cooldown time near is 0.16, and all this intel bulletin does is decreasing it to 0.1568. Correct me if I'm wrong.