some hedge fund company, no matter how big it is, saying they are looking into cryptocurrencies is not something that can trigger a big buy signal in the whole market. of course it is not ineffective either and I am sure some speculators took it as a positive sign and jumped in but it is not all the reason for the whole rise which was about 30% rise

regarding $300ish rise, you shouldn't really be looking at the number in $ you should instead be looking at it in %. for example Berkshire Hathaway price went up $5200 in a day but that is just 1% rise.