Definitely, for every pump or dump in cryptocurrency, there is definitely a news behind it. This is the concept of traders fundamental analysis. BSV pump was aa a result of the US court granting rights to Craig Wright as the founder of bitcoin (Satoshi Nakamoto).
That's already old news to be honest, for sure someone is buying and that's why the price rise. There is surely less liquidity since it's not on kraken and binance anymore so it only takes "little" money for the price to move a lot.