I can't really tell either but, it looks like there is what we call a "City Hub" (I don't know why we call them that) on the EMT. The conductor is clamped as it leaves the raceway.
I have been required to use a similar type hub, but the hub also had a copper strap attached with a ground clamp at the opposite end. Maybe this is what the inspector is looking for.
Why did you run 1/0? I would have used #6 cu?.. other than that general question, I don't see any violations.