When the change happened I reported it as a bug and a dev mentioned that the dps was returned to normal in age 4 not the damage itself.
The rof was buffed. Before the patch it had 8 rof but it got buffed to 6 rof so it’s age 4 dps is the same as before the change.
Personally I would like to see its building siege attack buffed by 100 damage so that it is comparable to an age 3 mortar. Currently it has worse siege than a 2 organ gun shipment.