Tesla is neither at scale nor profitable. They're selling barely 15,000 cars per quarter, compared to Toyota's 2.5 million. They're growing by taking on debt, diluting shareholders, subsidies, and other creative tricks (Model 3 preorders). They've been "profitable" for a single quarter by selling Teslas at a steep discount. Last quarter's report has been widely derided for the financial engineering therein. We'll have to wait and see what the sales numbers will be this quarter, but I'm pretty pessimistic.

Seeking Alpha is a mixed bag, but the authors are no more biased than the average wall street analyst. People who comment here also have their own agendas. Bias should be expected everywhere. As for your claim that anybody can write an article on there, that's not strictly true. They have a real name policy and failing to disclose properly can and will get you in trouble with the SEC.

By the way, having a short position and writing about why you are short (or the inverse) isn't a conflict of interest by any stretch of the imagination. The seeking alpha model is adversarial (like the justice system). People at opposing sides make their case and clearly state on which side their financial interest resides. Poor arguments get pilloried in the comments section. I think this model works remarkably well in practice. In order to figure out what's really going on forensic investigation is necessary, and that goes way beyond the plain GAAP figures.