I can't say categorically if the big whales will take advantage of this news and start buying but who knows? We all know the price went up upon news of an ETF approval and since the aim of every Bitcoin investor is to make profit, maybe they will use every window available to do so.
I think those who are waiting for ETF approval have already bought Bitcoin and are simply waiting for the moment when after the announcement there will be a pump, perhaps to sell.
In fact, it is very difficult to predict how everything will be, there are many options for the development of events, and I think that it would be stupid to wait for the approval of the ETF and only then buy, I am sure that the whales understand this very well. All you need to know is that they will once again try to trick you, so be careful.