>It’s a fuel, and when mixed with oxygen in the right proportions and ignited, it will explode.

That means it's combustible, doesn't necessarily mean it's explosive. If any combustible material mixes with air and fills a room with an ignition source it will flashover and cause an explosion. But to say sugar is an explosive implies you could put a match to a bag of sugar and it'll go boom. So no, sugar is not "explosive."