This isn’t true.
Toyota issued multiple engine controller updates. All mfgs do, all the time.
There are no changelogs.
It would also matter what their typical car lifecycle is, it could have been just before refresh so only effected a couple years.
It could have also been bad floor mats.
We’ll never know - but the point is, that their code was so bad you COULD never know.
They also never caught the clowns in the forest stealing children, nor the satanic groups sacrificing babies in the 80's.