If someone started adding all the coins claimed to belong to someone (Satoshi, Winklevoss twins, Mircea Popescu, Bulgarian governments and so on), they'd quickly find that Bitcoin's supply is more than 21 million 
No they wouldn't. That's not how this stuff works.
No, but this is how the news work, fake or not, doesn't even matter, since all exaggerate.
Some of those numbers are for real, but not all. And if you start adding up all those alleged lost coins in huge amounts from the news you have a good chance to already get to more than the current supply.