Did the Dalai learn anything about the ‘cultural revolution’ and the 70 million deaths?
Based on what he said, No.
Most marxists have the typical "if I was in charge, it would be different", or "It hasn't been given a real chance", or some other b.s. to explain away the failure.
Keep in mind, what he probably wants is a theocratic version of maoist marxism, thats not a nice peaceful loving thing, thats slavery that owns, body, mind and soul (and if he has his way, probably your afterlives).