All of their actions point at intentionally wanting that data to disappear, they even suggested turning it on and updating it, which everyone who's ever tried to protect important information on a computer knows is that exact opposite to what you should do.
Any competent engineer who puts more than 3 seconds of thought into the design of that system would conclude that crash data is critical evidence and as many steps as possible should be taken to ensure it's retained with additional fail safes.
I refuse to believe Tesla's engineers aren't at least competent, so this must have been done intentionally.
The requirements should have been clear that crash data isn't just "implement telemetry upload", a "collision snapshot" is quite clearly something that could be used as evidence in a potentially serious incident.
Unless your entire engineering process was geared towards collecting as much data that can help you, and as little data as can be used against you, you'd handle this like the crown jewels.
Also, to nit-pick, the article says the automated response "marked" for deletion, which means it's not automatically deleted as your reductive example which doesn't verify it was successfully uploaded (at least && the last rm).
Perhaps if there is some sort of crash.