1. There was a cyber attack on the Venezuelan power grid. This disrupted comms coming into the attack and made it much harder to coordinate a response.
2. It was not in any way related to this BGP, of which, as someone in networking, looks like a simple and fairly common mistake. It wouldn't really buy them anything anyway, the breach happened 6+ months before.
Yeah, the US government has advanced cyberwar fare capabilities, but this BGP anomaly is not a result of, or evidence of that.