I saw this question and I know I answered it in my head at some point. It apparently never made it to the computer though, so I apologize for that.

That rich list is technically correct, though it's a bit misleading, to say the least. The top 90 addresses hold/held the pre-mined coins. As mentioned, many of these cannot be spent (peers will reject any transaction that spends them and any block that contains such a transaction), so they aren't really available coins yet.

The coins reserved for the big give-away we're doing later this year are also included in that batch. Those aren't locked up technically but require (I believe) 3 company execs to gain access to them.

There are also quite a few coins from the pre-sale that participants have not collected yet. We didn't feel the need to artificially break these up, so any time a user withdraws some of their pre-sale coins it creates a a funny looking transaction with huge amounts of change. Those change addresses will likely make it to the top of the rich list as well.

So the short version (TLDR) is that yes those addresses do have those coins, but they are either multiple people's coins that haven't been distributed yet or they are locked up such that they don't really exist.