In the days following the phone call, I learned from multiple U.S. officials that senior White House officials had intervened to "lock down" all records of the phone call, especially the official word-for-word transcript of the call that was produced---as is customary---by the White House Situation Room...

So, a complete word-for-word transcript does exist. So why did the White House release a non-verbatim, summary record? Why is there the note that it's a rough summary that "records the notes and recollections of Situation Room Duty Officers and NSC policy staff assigned to listen and memorialize the conversation in written form as the conversation takes place." on the first page?