The central banks could be the ones stacking Bitcoin already preparing for what is coming.
They could even be the ones planing the covid19 and the timing for the winter, all these will really make the economy fail plus the political instabilty.
I don't think that's happening. They cannot hide that information. If they were stacking bitcoin they would have reported it. Central Banks are not your average sneaky investor. The moment they touch any crypto, the word would be out.
They can clearly hide it depending on what they are using it for. Just to give an example we do not know hundreds of millions of dollars going to pentagon that we have no idea what's it is spending on, of course pentagon is not central bank but I believe all of them are connected, every single government branch is definitely connected to each other, which is why I think they are definitely working together when it comes to bitcoin.
You could always have central banks print money and give to someone for "secret stuff" and just tell them to buy as much bitcoin as you can. Does this make sense and are they doing it? I do not think so, they are probably not doing anything like this, but I just wanted to point out that it is definitely something possible if they wanted it but when you think about it, it doesn't make sense to do something like that.