Yes and no. The (delightfully named) bitdiddle may have a point.
Although the CME futures will be cash settled so Bitcoin will not be directly involved, it's not clear what would happen if there was evidence of price manipulation.
For example, if there is an anomalous spike on a stock exchange around the time of the futures mark, this is always investigated.
If a similar thing occurred on, say, GDAX (which will be included in the benchmark), it's not clear what that would trigger. It's possible that the answer is nothing (there are futures on Libor after all) but it doesn't require much tinfoil to see this as a possible point of attack.
