I think he just typo'd the %. From the terms[1]:

    Linode.com provides a 99.9% uptime guarantee on all Linode hardware,
    and on network connectivity. In any given month, if your Linode is
    down for more than 0.1%, you may request a pro-rated credit for the
    down-time.

[1]: http://www.linode.com/tos.cfm