Ok, you said
You are conflating the initial report with in depth investigation.
The preliminary report has factual errors that have been addressed by later reports. The FSD option is just one example of the inital report clearly being wrong.
Data provided after preliminary report:
Owner is on video getting into the driver's seat 500 feet or so from the crash site
Seatbelts were unbuckled
Steering wheel is deformed
Car did not have FSD
Testing did not show that TACC was able to be engaged at that location
Further, TACC, even it were able to be engaged, even if it drove off the road, even if it operated with seat belt unbuckled and no one in the driver's seat (it doesn't), would not accelerate at the rate needed to produce the crash.
But don't rely on random internet post, read what Tesla's people with expertise in the field have to say:
Tesla (TSLA) Q1 2021 Earnings Call Transcript | The Motley Fool
Related article :
No, Media & Politicians — Autopilot & TACC Weren't On In The Houston Crash