Yeah it has been proven now that the price did not crash after halving. There was little time of dump of bitcoins but that was because of Bitfinex hack and halving has nothing to do with the 20% decline in price at that time.
Proven how ? Not being pessimistic about it, but I do remember seeing the price going down a bit just before the hack happened, which was something I believed to be weak hands giving up the bitcoins they have , which they saved for a price rise during halving.