How can one distinguish this testimony from rhetoric by a group who want to big themselves up and make grandiose claims about their accomplishments?
But the other side is downplaying their accomplishments. For example Yann LeCun is saying "the things I invented aren't going to be as powerful as some people are making out".
He also says Facebook solved all the problems with their recommendation algorithms' unintended effects on society after 2016.
> You can also ask that question about the other side
What other side? Who in the "other side" is making a self-serving claim?