The security researchers who were expert witnesses in the Toyota case and that analyzed Toyota's source code testified in court that they managed to reproduce the unintended acceleration with a real car on a dynamometer.
The engineer was questioned:
" Q. Now, you have not reproduced in vehicle testing your 25 theory that there's a software bug that opens the THIS TRANSCRIPT IS NOT PROOFREAD 30 1 throttle and then the task dies, have you? 2 A. No."
From page 245. Further reproduction questions were all answered with a no further.
To get a successfully task death failure (what the engineer wanted to happen) the engineer had to modify the source code.
Further in the limited testing even with modifications, the failsafe triggered 100% of the time.
Your statement is incorrect.
I once had a project with a major lobbying organisation with links throughout the automotive industry. The one that published regular reports on real vs declared emissions discrepancies long before the VW scandal.
They were unanimous when asked about the unintended acceleration bug. It was a case of mass hysteria.
At least according to the summary based on sources used for Wikipedia:
https://en.wikipedia.org/wiki/2009%E2%80%9311_Toyota_vehicle...
The page you refer to has a section "NHTSA and NASA Investigation Verdict" and it says nothing about the software bugs.
https://en.wikipedia.org/wiki/2009%E2%80%9311_Toyota_vehicle...