They do, to a point.

If it's a "trim" that is a vague percentage without any standout cuts in recognized people or groups, then good. If there are recognized names or groups, but they are people associated with widely known failures, like a team whose sole responsibility is a proven financial failure, good or even better. If you have people caught up in it who are well recognized for critical successes, then the investors won't be so bullish.

Here we see two groups seen as responsible for the key success factors of Tesla obliterated, with very little external signs of why this could be a rational move. The other layoffs might have been viewed well, even if some of them were also bad news, but I think these two will be viewed as bad news.

Also, this may be seen as a missed opportunity. Tesla established SC network as the premiere EV charging solution, and made it credibly cover other manufacturers, setting it up as independently valuable with it without Tesala. Tesla ditched the entire team, putting that at risk and taking on expenses to let go of those people for long term salary savings. A different business might have sold off the group intact, not only avoiding severance expense, but also getting a big check in the process from some other company. Keeping the "business" with none of the actual people is a bizarre move.