I took the 29/10 date as it seems it was the latest update to the game (IIRC it was the flame patch). Taking previous dates is just taking into account a different patch.
I'll argue that small tweaks to OKW, adjusting ISG/Howie and nerfing Rifle company would had done way better than this whole OKW revamp.
even with retardedly stupid ISGs, OKW had lowest winrate.. and from watching 1v1 streamers, the games against OKW were laughable most of the time. i doubt that small adjustments would have helped... and even calling it "revamp" is a bit much.... all they really did was move a few units around in tiers, remove the ressource penalties and in turn remove some of the vet4/5 bonuses (and "smaller" changes to units... especially the kübel, which i think is one of the factors that is making OKW so strong right now).
taking into account older patches was EXACTLY what i wanted to do, since OKW has been "revamped" you can almost treat them like a "new" faction like the brits... so you'd expect them to behave as such in winrate.