So? Obviously, the April 5th letter didn't address an April 8th meeting. It recorded an earlier meeting between the governor and Talbot where it was made clear that any ship that ignored warnings and approached the fort would be shot at. This earlier meeting is also documented in the Official Records in an April 4th letter by the other US attendee, Lt. G. W. Snyder. From that letter:
In compliance with your directions, I went, under a flag of truce, to the city of Charleston, in company with Captain Talbot, and had an interview with Governor Pickens and General Beauregard.
While we're on the subject of the OR, remember this quote from your earlier post?
"In returning from the city Lieutenant Snyder called for the mail at Fort Johnson, where he also took on board a small supply of beef and cabbages, which had come from the city the day before, too late for our boat?"
Why didn't you continue with the next paragraph?
"My supplies of provisions that I laid in before the commencement of the investment were yesterday reduced to one half-barrel of cornmeal, one-seventh barrel of grits, and eleven codfish. Everything else that is necessary for the support of the Engineer force is drawn from the scanty stores of the command."
So the fort was short of food and supplies. And since Beauregard had been ordered to end the flow of food to the fort on April 2 then there is no doubt that the intent of the southern forces was to starve the fort into surrender, and that the fort was close to being at that point.