McMaster's statement was carefully crafted so that it denied something that the Washington Post never claimed. 

Read the Post story carefully: "Trump went on to discuss aspects of the threat that the United States learned only through the espionage capabilities of a key partner. He did not reveal the specific intelligence-gathering method, but he described how the Islamic State was pursuing elements of a specific plot and how much harm such an attack could cause under varying circumstances. Most alarmingly, officials said, Trump revealed the city in the Islamic State’s territory where the U.S. intelligence partner detected the threat. The Post is withholding most plot details, including the name of the city, at the urging of officials who warned that revealing them would jeopardize important intelligence capabilities."

Read the second sentence of the quote above carefully. Pay attention to "He did not reveal…" 

McMaster's statement is a fake denial.