Not an Elon fan, but markets dictate the value, not analyst reports or "fundamentals". The stock is simply worth whatever people will pay for it. The fact that people are paying an implied valuation of 2T for it currently is a strong signal IMO.
In other words, markets are great at discovering the price at which something will transact, but that's just a function over all price expectation of all market participants.
But each participant can do their own fundamental analysis. This is one of them.
Some participants are better than others at such analyses. It's up to you to think through the ones that get published.
Pricing things differently from the market observed price is how you get alpha.
Strong signal of what?
You’re mixing the colloquial concepts of price and value, imo. Price is where people who want to sell meet people who want to buy. There are entire industries dedicated to evaluating assets, i.e. assigning them a value, many of which do not have a “price” because they are not for sale. Morningstar is part of one of those industries.