true, to a point. at the instant the field collapses, the cemf will be nearly as high as the emf generated by the motor supply voltage. as the field continues to collapse, the voltage generated will be very high as time will be very small. a large diode like a 1N4005 will be good for 1000 of those volts prior to breakover, and will absorb a large spike in excess of that. you also have to factor in some motor reversal (small) and the effects of the dynamic braking (resistive) to hte inductive load. your net current (for a short time) will be high. most will be wasted as heat thru the braking resistor and the rest will be blocked at the collector/emitter junction. i believe that is why systema chose not to use a blocking diode as a seperate component. they must have felt that between the braking resistor and the 2 fets, that should be plenty. and besides, a large inductive spike is far more likely to damage a processor than a fet, and without seeing the processor, i can't confirm how much direct diode protection it would have. i can tell you though that the fets have none.
the website is
www.nteinc.com they have a cross reference area. they only supply data for their part #'s and not the original that you input. as far as a cap across the motor leads, there may be one, but i haven't opened it up to see. at any rate, either there is one or not. neither concerns me too much as rfi is generally a non-issue for aegs and brush life extension is based on so many other factors of much larger importance, that it isn't worth my effort to install a cap in a difficult (and probably tight) spot and one that is prone to damage from a variety of things.