Just because an entitlement is defined as "An individual's right to receive a value or benefit provided by law" doesn't mean the right to recieve a monthly NRST benefit payment from the federal government is an entitlement because, er, uh... Shut up, that's why!
Making stupid stuff up makes you sound like you're hiding the real reaosn you oppose reform.
The more apropos would would have been "a government program providing benefits to members of a specified group". which would certainly exclude the prebate since it is not part of a government program but just part of the tax law and the "specified group" is all qualifying taxpayers.