exactly, that guy was just a fall guy. If a system / organization is designed such that the fate of something as critical as an aircraft depends on ONE test pilot, that system needs to be re-assessed. All those managers / senior engineers / decision makers should be fired / fined and the worst of them should be put in prison.
Most people seem to be giving him the benefit of the doubt that he has cold feet. Personally, I think this was sabotage, he had no intention of buying Twitter in the first place and this was just a ploy to fuck with Twitter.