If we are to be really honest with ourselves, the cause of the recent dip in the market is not because of Elon Musk tweet or because of China ban on crypto (though it added to it). It is because the market has been in an overbought position long enough. Taking Bitcoin for example, the price increased so fast (leaving a price imbalance/void) without any serious retracement or correction. So the market is just correcting itself.
Your point is correct but their is somewhat effect of Elon musk's tweets and Somewhat effect of China ban on Market. If China have not banned than many people have been still holding their crypto.
The tweet and the news where just the final push off the cliff. The crash would have come regardless, it is not very important what was the final reason