I think you and the article have this wrong. 45mph is with the speed governor removed. The article doesn’t make it clear whether the parent misspoke and the reporter didn’t fact check or that the reporter just mistyped, but you can’t get anywhere close to 70 mph with a 6kW peak motor. There are people who have modded the hell out of these and poured thousands more dollars into them to get those kinds of speeds, but that’s not possible with a stock bike.