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He'd crashed and was trying to get back to the front group. It was blatant and caught on camera hence the disqualification. But if he'd been getting the magic spanner treatment whilst they gradually towed him back up, no one would've complained.
There's also the fact that he was not driving the car, so the ds who decided that was the right course of action should bear most of the responsibility.
Wasn't it on camera because it was a key moment? I can't recall exactly, I just know it was pretty dirty. There's also a large difference between his 80kph tow and adding a bit of momentum to get back into the cars after a mechanical.