"when it was revealed that the NSA had actually, and pretty amazingly, undermined hardware random number generators on widely available chips"
Such a thing was never revealed.
"I have no idea if the NSA convinced Intel to do this with the hardware random number generator it embedded into its CPU chips, but I do know that it could." (could meaning it is conceivable here, he doesn't investigate anything about feasibility)
No one ever showed that the NSA did this. No one even tried.
It's really frustrating to see speculation reported as truth from a person who seems very careful to try to be sensible and not just ring alarm bells to get notice.