Elon also said "Beta 9 addresses most known issues" only two days ago- I'd think killing your users at every unprotected left would be a known problem that most people would assume they would focus on fixing during a foundational rewrite.
There's a Elon tweet for every point of view as long as you ignore all the other tweets!
What I think is most interesting is how minimal the changes are for supposedly a complete rewrite. I have a feeling what he really meant was that some corner was rewritten- like distance estimation to remove radar But the rest of the logic is the same as before, so basically the same issues continue to exist. In my skeptical view, this is just another place where Elon is disingenuous in his communications, hyping small changes with imprecise language, knowing people will assume it means much more.
Remember, this is 8+ months of progress since V8.. If this is the rate of improvement, we're a very long ways away from generalized self driving.