The answer is: No.
I asked Chief Nigro about this, and he was kind to respond very quickly. What he said was basically this:
Originally Posted by Chief Nigro
I am well aware of Mr. Silverstein's statement, but to the best of my recollection, I did not speak to him on that day and I do not recall anyone telling me that they did either. That doesn't mean he could not have spoken to someone from FDNY, it just means that I am not aware of it.