The most direct way to test whether a news story really had an impact is to compare trading volume before and after it was published.
For example, this headline: Cryptographers warn that AI could weaken the security of Bitcoin and Ethereum wallets. $BTC trading volume: 1.584 billion.
At first glance, it seems negative. But to gauge the impact, watch whether selling pressure continues.

Be aware of the risks and make your own decisions.