Your point would have made more sense if you had said Soviet Union rather than Poland. Hitler never made any promises to Poland. In fact, they pretty much knew their goose was cooked, but couldn't convince enough people to care in time. So I guess you would be Poland.
The Poles believed that the invasion was intended from the beginning as a war of extermination. Hitler allegedly said to his commanders: "I have issued the command — and I'll have anybody who utters but one word of criticism executed by a firing squad — that our war aim does not consist in reaching certain lines, but in the physical destruction of the enemy. Accordingly, I have placed my death-head formations in readiness — for the present only in the East — with orders to them to send to death mercilessly and without compassion, men, women, and children of Polish race and language. Only thus shall we gain the living space (Lebensraum) which we need. Who, after all, speaks today of the annihilation of the Armenians?"
History of Poland - Wikipedia
A better, though no less repulsive, analogy would be Hitler and rich, rich Switzerland. Unless of course you doubt Gumppy's ability to uphold his word.
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