Sure, no one is denying that Josh isn't getting the help he needs from his teammates and his coaches. That's not on topic.
A ball carrier is a ball carrier, a fumble is a fumble. Once he takes off, the many reasons prompted him to chose to run don't have any impact on his ability to hold on to the ball. What you are suggesting makes no sense.
Fields had 33% more carries last year and 31% fewer fumbles. Fields had 30% more carries but only 18% more fumbles. Both had a higher "success rate" (at least 40% of the yardage needed on 1st down, 60% needed on 2nd down and 100% needed on 3rd or 4th down) running the ball.
There's no such thing as a separate "I'm not getting any help" fumble.