While I’m sure Holocaust historiography has evolved over the last 50 years since it was published, the latter half of The Twisted Road to Auschwitz: Nazi Policy towards German Jews 1933-1939 covers how among other plans to set up Jewish colonies around the world, the Nazis did cultivate relationships with Zionist groups when trying to expel Jews from Germany.

The book makes a case that, to the Nazis, the Holocaust became a “final solution” when all the other “solutions” they tried for expeling the Jews from German public life failed (eg, the aforementioned failed colonial projects).

I’d say that Evrala’s comment has plenty of credible historical support.