The INT was the only objectively forced turnover …
I agree with you (and others) that speed can be a factor in mishandling balls.
One punt muff was a routine catch that all punt returners face. The second one was a poor decision by the returner to attempt.
Two fumbles on toss plays were routine while having zero defenders in the backfield.
And worse one was when the QB inexplicably dropped the ball into the end zone. He was untouched and dropped the ball.
Through an unbiased lens they were unforced.
Nevertheless, it’s still a huge victory for ND and many good things happened today.