Hardly an "entitlement" which is "... a government program providing benefits to members of a specified group ..." unless you'd like to designate all taxpayers as that group.
But the FairTax is revenue neutral (including the prebate) at 23%. In fact if the bill passed right now it would be revenue neutral at something like 19-20% rather than 23%. A plan that will so strongly boost the US economy far beyond where it now is can hardly be considered a "tax increase" even in your warped terminology.
After your huge entitlement it is revenue neutral. Certainly it will probably give the government the $2 Trillion that it currently spends, but it will have to raise about $2.3 Trillion so it nets $2 Trillion. Social Security is an entitlement eventhough all taxpayers who have paid into over their lives are qualified. Everyone with a Social Security number is entitled to the fairtax prebate. It is certainly not a refund because there is no requirement that they pay a dime in taxes.