The "Cultural Revolution" began 2 years after the detonation, and is quite typical of "Saving Face" manoeuvres used by those in power in China.
So, the Cultural Revolution was a face-saving maneuver? Sorry, I can't agree with that.
I don't understand why you're so invested in this nuclear detonation theory. First, it's irrelevant to the discussion. It doesn't really matter
why China has a chip on their shoulder. We can agree that, to a large extent, their development was delayed as a consequence of their own actions. Second, it doesn't strike me as plausible that they would concentrate the entire intellectual class of such a big country in one city. Third, enough information leaks out of China that such a tragedy should be much more widely known.
This has all the hallmarks of an unhinged conspiracy theory. The only part I can't dispute is that they had some sort of costly nuclear accident. That much is believable.
There is no advantage to be gained in arguing the facts of the errant detonation, nor the damage it caused to the scientific community in China at that time.
Okay, so let's drop it. Unless you can point me at some serious scholarship on the subject, I'm about as likely to believe it as the claims posted by our new friend.