Nonsense. Lincoln stated as such in his message to Governor Pickens. "I am directed by the President of the United States to notify you to expect an attempt will be made to supply Fort Sumter with provisions only; and that, if such attempt be not resisted, no effort to throw in men, arms, or ammunition will be made, without further notice, or in case of an attack upon the Fort."
What Lincoln stated in his message to Pickens was also a lie. He did not order a resupply of Sumter, as has been demonstrated many times before.