I wonder if they meant Mashima? Spookshow's review of the 4-4-0 and 2-6-0 mentions 5-pole Mashima motors.
The original releases of the 4-4-0 and Mogul had 5 pole Mashimas (they are 1015's or perhaps 1020's). I have both
engines, and have had the 4-4-0 apart to confirm that it is one of the usual closed-can 5-pole Mashimas we know (and love).
Those were the only two MP steam that had those. The others got some other cheaper thing.
I can't believe they would retool the frame to accept a different motor.
Did you happen to see an actual preproduction sample of these, or is it all just sales talk for now?