You're right, sometimes not every kind of breaking news affect the market price, some would have thought about many things regarding this, but yet nothing changed than things were going as normal as being expected, i don't think the value of BNB would also be affected by any means, because what i first thought when I heard about the news was that the exchange will be affected with government regulations and this can cause any form of stoppage in any of their operations or services, but i discovered i was wrong also, this remaining days for 2023 is more for bullish.
Market can sometimes be effected by news but not all the time because previously there was a news about Elon musk that he sell all of his bitcoin which effected the price of bitcoin and it reduced to tha worth of 26k$ but again positive news were developed which totally altered the Bitcoin's value and it touched 44k$. So if bitcoin can be effected by news then its simple that other type of coin like BNB will also be influenced by it.
All the time it is not effected and also the effect on btc is for short time and again it takes positive turn to give benefit to its holders. New effects in the way that people often work according to news so bitcoin demand increases so greater the demand greater will be its worthiness. Now a days you will be familiar that news about halving is spreaded all over the world which elevates the demand and directly there is surge in Bitcoin's cost.
Every negative news has different effects in the market, just like what you mentioned about years ago when there was news that Elon Musk or at least his company sold his Bitcoin and the market reacted by selling and there was a massive decline.
But recently, there was also a negative news about CZ and his Binance and billions and penalty. But the market didn't react to that news and instead the price remain steady and then a few bumps to $44,000. So it's really up to the sentiments of the market, whether we will reacting negatively and a lot of investors selling or the emotions are just in a straight line, no reaction whatsoever.