No, not for a company doing what Tesla does. In the environment I used to work in, that would have been flat out impossible. No change would have been allowed that did not follow process unless an explicit and documented exception was made.

Even if you did manage to commit code to the release trunk without review, every single change to the codebase was checked before the release process started in order to verify that the right process was followed. If we ever found a change that no one could find paperwork for, it would be reverted.

So, yeah, it's possible if you want to do it badly enough.