I don't see it quite like that. Employees and contractors certainly receive instructions and reasons from upper management - and where not, deduct them themselves (accurately or inaccurately). Thus I'd agree what he/she says of Elon certainly is likely to be hearsay or conjecture, but not unlike the kind any real employee or contractor of any organization could have of upper management. His/her story certainly *could* be a real account from someone in Tesla's supply chain. It could also be a reasonable(ish)-sounding trolling attempt.
I agree with ohhman this being quite futile, though, at this point as nothing can be verified - so consider my ponderings merely theoretical musings on sources and leaks. I mean, as far as Model X news go, that's the best we've got until Tesla spills the beans.
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Of course, that is part of the risk with anonymous sources. That said, it is the same with real anonymous sources. To consider the latter, one has to live with the risk of former. Ignoring both is an easy road some like to take and that's fine, but sometimes the harder road can bear some fruit.
Do I think the multitude of analyzing and speculating have provided us with a more accurate pre-release view of Model X and its release timeline? Absolutely. Do I think it could have been achieved without considering anonymous sources? Not really.
The likes of Eds are just a part of a puzzle. In isolation a risky unknown, but overall as a whole part of something useful.
An anonymous source implies some credibility. He has none. A reporter has some way of verifying at least some of what an anonymous source is telling them on the internet prior to going to print. This is some random person on the Internet for all we know. Not everything needs 'balance' and two equal sides to everything.