TLDR: If you believe in free-will, then it's possible for someone to beat highly-accurate 3rd party estimates.How can you call them "highly-accurate" if they aren't accurate? Yes they can be "best available, given the information known", but we're talking about predicting the future - it's impossible to have all the information; if your prediction is wrong, you don't get to call it "accurate".
If you don't believe in free-will, then any mis-estimates are purely due to analyst error
That doesn't make it analyst /error/. It tells you the analysts' understanding of Tesla as is not as good as they thought. If they had predicted the result spot-on, they would be excellent analysts working with excellent information. They didn't, so now you know one or both of those is not excellent, or both, or they made errors.
If you see companies as a force-of-nature that can only be marginally influenced by humans
To go down this route, you have to imagine Tesla didn't really want to produce many cars at all - all the incentives and motivation they have about making lots of cars, earning millions, paying debt back, the incentives employees have for bonuses, doing what the boss says, staying employed, all amount to virtually nothing, but the commentary from Jones of SomeBank is enormously influential and can turn the entire company round. That's so disproportionate, I can't just take it as given.