Well, I just find it hard to think where ethnical Poles got their Ariernachweis
**** BB everything whats real is murky, we haven't been talking about Poles living in Germany and having German citizenship - thats quite murky area!
As for ethical Poles? I don't know how, look for it yourself in German sources,
One reason comes to mind - Poles on the territories incorporated into Germany in 1939 before 1918 were German citizens, and before them their parents and grandparents, sometimes for many generation, maybe it had something to do with it and a fact that Germans governors were allowed to adjust a bit general policy on the territories govern by them?
latency of Polish government it the fact and some commentary about attitude of Polish soldiers towards Poles in German uniform weren't so one sided and simple as some American seems to believe, as a example: my grandpa, an officer in Army "Poznan" which kicked some German asses,taken as a POW by Germans in 1939, was treated by Germans front line troops very good, corporal said to him Soldad ist ein Soldad - or something like that.
And as you well know general attitude towards Poles, soldiers or not wasn't that nice!
So, I wouldn't jump to conclusions about the way Poles were treating Poles in German uniforms based on one testimony even if that guy believed it.