Tell me more, what's your interpretation of the report.
Do you believe Somchai?
OK, inspector, case closed, let's take Somchai's word what happened.
Sadly, we'll never know the truth, 2 young women are dead.
Why interpret the report any way other than as stated unless you have a very good reason (not available to the rest of us) to blame the truck driver? I have no reason to disbelieve him and I doubt that you have either.
What makes you think that "the truth will never be known"? The article specifically stated that there is an investigation going on right now.