If Hitler wanted to take over Russia, he should have done a much better job of it and learned from Napoleon. That Hitler wanted, or tried, to do X and X didn't happen as intended is not evidence that Hitler didn't want to do X.

That said, I was a bit surprised to learn a few years ago that there is some disagreement on this, i.e., that Hitler wanted the Jews expelled not dead, but the Mohammedians didn't want them either, so the fall back plan was killing them.

See this article: https://www.haaretz.com/israel-news/netanyahu-absolves-hitler-of-guilt-1.5411578

[edit for clarity]