It would be considerably more surprising if any member of senor management gave a tinker's damn for the collective opinion of a niche forum website.
More likely, for all we know, Reyes agreed to come back for a set period of time or set of objectives and finished early. We might see him back once again - who knows.
Similarly, losing the VP of Finance recently is perhaps not a tremendous cause for alarm since they just got a new CFO. Sour grapes, communication styles, changing workload, who's to say.
I recall from back in the day during the first Internet boom in Silly Valley (tm me) that the average tenure of a CIO/CTO was right at 18 months.
Now, without parsing that too carefully, I do hope for the sake of my shares that what we see now is merely strategic alignment and upgrading, versus the whole rats from a ship thing or similar.
Ironically, the thing that would mitigate the turnover reports would be a well-timed spate of, you guessed it, corporate communications.
I recently encountered an alumnus of more than one of Elon's companies - I told him about the over/under we used to have at other companies in the area, which was 65 hours/week. He laughed and said he worked that in 4 days. Point being it ain't an easy work environment for most people - there really is a palpable buzz in the air and you either thrive with it or it will eat you up and spit you out without so much as a courtesy reacharound.
I expect the turnover to continue - just wish they'd manage it a hair better to reduce speculation.