I don't think it was your intent, but your statement makes it seems like all Tesla engineers are looking at Twitter code. I bet this number is closer to 4.
Tesla has ca. 1000 software engineers working in various capacities. The ca. 300 that work on car firmware and autonomous driving are probably not participating in the Twitter drama.
I don't think the goal is to review all Twitter source. That should be the job of the (new?) development team. I think the goal was to look at the last 6 months of code, especially the last few weeks, for anything devious.