Interesting, I will definitely check it out. That does explain the bottom notches where the tang meets the blade, but the flats seem very poorly formed, I imagine something wasn't 100% right, the dies were offset perhaps? Or there was a graphite chip etc.?
Looking from the tang at the heel those “flat grinds” are the initial hollowing which is done with a larger diameter wheel. They then go down to a smaller set of wheels to thin the section behind the edge to the spine. You often see those kind of tabs left because to create the stabilizer they don’t grind all the way back to the heel.
The asymmetry was probably something as simple as the person grinding the razor had the whole blade tilted at an angle while working.