I watched that venom and Explosion fight back, and:
1: Explosion was not on its wheels for 11 seconds.
2: Venom then pinned it (on the wall and then with the claw) for 30 seconds (right at the end of the 30 seconds, Venom drove explosion and himself in the pit.
3: Explosion was mobile again within 30 seconds (escaped the pit and then turned itself back over.

Does the 30 second immobilisation rule come to effect if it gets pinned during the count ? I say (and the rules say) no. By the rule set at the time, Venom lost fair and square.

As for the pit rule, would prefer 10 seconds to 30 as a compromise between comp rules and the entertainment factor (the audience wouldn't want to wait the full 30 seconds).

I did not hear of any discussion about changing the rules until Kane informed the judges at the HW champs.