Indeed.
30 million people rubbed out in a 10 year frenzy or chaotic redaction.
the result? An entire nation has memory problems.
It will take a century or more before the information can be rebuilt accurately. And only if the corrupted communist government is removed entirely and forever.
Don't forget that many martial artists, especially teachers and significant adepts were jailed, crippled and put to death by Mao and his henchmen during the dark time of 1966-1976.
This is why you don't need to go to china to learn kungfu.