Ann Donaldson said there were three shots in her Sixth Floor Oral History - the relevant parts are around the 20:00 minute mark. She said there was a loud noise - the first shot - and then two more shots.
You shouldn't believe everything you read in newspapers. Sometimes reporters get things wrong.
But as even the WC noted, and as Jack analyzes in
Phantom Shot, witnesses tend to evolve in the direction of the "accepted narrative" - sometimes within mere hours or days. By the time of the Sixth Floor Museum interviews, witnesses may have convinced themselves that the "accepted narrative" is what they actually experienced.
I also find it kind of bizarre that anyone would call Nellie Connally's credibility into question for saying JFK clutched at his throat. To any real-world observer who isn't analyzing enhanced Z-film frames with a magnifying glass, that's exactly what it looks like. The Connallys strike me as fantastic witnesses.