I think the parent poster is just trying to count the total number of functional democratic vs. {nonfunctional democratic, non-democratic} regimes at any given point in time. WWII didn’t create the USSR, so that doesn’t make the count go down; nor did those dictatorships they later propped up just come into existence. (Propping up newly-formed dictatorships when they emerge out of previously-stateless areas is more the US’s thing.)

But WWII did take a few rather large European empires with disenfranchised colonies, and turn their member states into independent, (at least temporarily) functional democratic nations. It also produced semi-global representative-democratic “treaty organizations” in the form of NATO and the UN, which, again, were at least temporarily functional and taken seriously and used to enact changes by the will of their members.

(Really, though, the member nations of NATO/the UN just all had a good temporary working relationship due to being either on the same side of the war, or being made powerless by the means of their defeat, so these bodies were just a formal representation of the way their leaders were already talking to one-another at the time. As soon as everyone in these nations got newer leaders, these bodies stopped “working”—because it was never the bodies themselves that functioned in the first place.)