He said something like ... Hitler supported the idea of Jews being moved to Israel, but then he went made and decided to kill them all instead.
The suggestion that for a while Hitler support a Jewish policy was deemed antisemitic, and he was accused of being a Holocaust denier, even though in the same sentence he described Hitler as mad and killing Jews.
It is easy to see how both sides of the argument can, and have, been made against him.
Only he knows what he really thinks. The role of a politician is to be diplomatic and balanced.