You can't dig your way out of hole but people keep trying. Was referring to you so much as the little I have seen on the news. It was poorly worded and if it was from a prepared statement then that is bad but if he said it off the cuff.... Meh
Any really comes down to semantics. If you put people in a room and poison them is that using a chemical weapon? Not by the classical understanding of the term. If he had poisoned their food would we consider it a chemical weapon? The bottom line is he is right that Hitler never used chemical weapons I combat (which was the obvious intent). As far as I am aware the US was the only one to use WMD during that war.