I think people are looking at this the wrong way. It's not so much about the code as it is about establishing an authority. Musk takeover is often regarded as banditry and I wouldn't be surprised if the employees didn't take him seriously in the beginning. This is his way of saying, "I don't trust you, I don't know what you have been up to but things are going to be different so better get used to it."

Using Tesla engineers is just to get everyone talking. I don't think they can get a clear picture by looking at last 30 days of code but they can use this as reason to lay a lot of people off. Not that Musk needs reasons, obviously.

In my mind I think Twitter is going to go on a very, very different direction than we all expect. You have to understand that Musk isn't after the big dollar here but rather he is experimenting which has a lot of chances to fail. Twitter could become extraordinary or it could become utter trash, we'll have to wait and see. Personally, I am quite excited to see where this goes.