Wrong guy. Thallman gave a speech in Hamburg in May 1932 about the launch of the Antifa organization criticizing anybody thinking they can benefit from Hitler taking power and warning you can't play with fascism. Then a book in the 1970s picked out where he's quoting the idea he's against and only quoted the quote trying to manufacture this convenient ironic twist where actually communists deserved to die in death camps.

The head of the SPD social democratic party paramilitary wing Reichsbanner gave a speech in February 1933 (right after Hitler took power, right before the Reichstag fire) and did actually say "after Hitler our turn" arguing it was good to let Hitler expand the military because the SPD would get a cool new army when they won the next election.