Yes, it apparently flew directly over a conventional Triple A site at low speed (remember the sort Jane Fonda was pictured sitting at) and the gunners fired hitting the big target right over their heads.
No, the shoot down didn’t go quite that way. It was missiles. They ran the same route too many times in a row. They learn to not turn on radars until the bomb bay door opened. Shot down by missile.
It was a very skillful ambush, taking advantage of poor tactics.