Yes, that's very often the case with things that would very likely be shared if it looked good.
There are things that don't get shared out of principle. For example there are anonymous votes or behind the scenes negotiations without commitment or security critical data.
But given that Musk tends to parade around vague promises since a very long time, it seems sharing data that looks very good would certainly be something they would do.
If a company wants to sell you something, but wants to block access to information, the default position for everyone should be "it's probably because it's bad".
If I have an investment fund and I refuse to tell you about the current performance, I hope you would be sceptical.
If I try to sell you medicine and redact the information about whether it does what I claim, and block you from seeing how many people were poisoned from taking it, I hope that everyone would refuse to take it.
The insanity I'm seeing here from Tesla defenders is amazing. I can only assume they've fully bought in to the vision and tied assets to it and refuse to acknowledge that they might lose everything.
It's a public company making money off of some claims. Not being transparent about the data supporting those claims is already a huge red flag and failure on their part regardless of what the data says.