For me, watching the cut down replay, it looked like Olave didn't make a complete football move before the ball was out. He only had 1 step. That was a momentum changer. Then in the 4th, when it was still close, the Mcollum interception... he fumbled that ball. Another momentum killer. The Saints did not play well. The officiating was horrible. But, those 2 non-calls happened at the worst 2 times in the game, in my opinion.
It was close, but looked like he took 2 steps and tucked the ball away. I could see why they called it a fumble. On the McCollum INT, the fumble did not occur because he was already down by contact at the point of the INT. Regardless, TB recovered.