TL: DR - Hub didn't call Fields a bust but thought he wasn't ready and that there was nothing that could have been executed against that defense by Nagy because Fields isn't ready. He doesn't think everything else supported Fields succeeding but seemed really desireous of claiming a W on his view that Fields was the thing that caused the collapse.
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Me personally? I've been all aboard the "play him and let him take his lumps" camp but if Nagy isn't willing to use screens, roll outs, additional blockers and other basic concepts to help him out, I don't think there is much benefit.
To be fair though- I hear that screens are installed in version 505 (that's a masters level course) of his offense. So maybe next year.
Also, Hub has been falling on my "respected analysts" list for the last decade+. I can think of a TON of guys I would rather hear from at this point.