People choose life or death. Those choosing death are in Hades. Before your verse, John notes that finally, Death and Hades are thrown into the Lake of Fire. Obviously this means those who chose Death, chose Hades go into the Lake.
The interesting question is whether it is a purifying fire...or only what is evil is consumed. You brought up Hitler earlier.
If he is thrown into the Lake of Fire for his many adult sins, will he cease to exist at all? Or, will all his impurities be burned away and perhaps he will continue at a time in his life when he was innocent, good, and even loving? (If there was such a time.)
The Bible doesn't say.