That could be true because, with the stolen bitcoin, they can do whatever they want, especially to pump their coin. But I don't believe if bnb do that to increase their coin because binance was one of the best exchange so far. But well, we never know the right situations that happen in binance, and we could only guess of what is happening in binance.
Inside job or whatever it is, BNB is still undeniably successful and seems like it will not stop leading the uptrend at this bullish season.