lol, isn't that the tactic Hitler himself used? He wanted to "liberate" the German speaking peoples in the surrounding nations.
The territory of modern Poland which was part of prewar Germany was central Pomerania and part of Silesia.
That would be roughly 5 million people today.
I think perhaps the laugh is on you, in that this “tactic” is the exact rational used to arbitrarily create a Polish state where there had been none for almost two centuries.