The shares are perfectly tradeable. The float number just assumes that they are not currently being traded.
Float is very different from Outstanding Shares (O/S). Float is just an estimate of the amount of O/S that is being traded. It is a GUESS. An educated guess, but a guess all the same.
Yes, just because someone hasn't sold them into the market doesn't mean they are not tradable. Unrestricted shares are for sale, you just don't know when they will be sold. When you read the Float is 10,000,000 shares on X date, that is already stale informatio, as it has likely changed if there were unrestricted shares..
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