I'm not surprised with this (if this is true) to be honest because I know that the market has been manipulated by the institutions and rich people for many years already.
To the OP, would you please share more information like screenshots so that we will believe in what you posted here
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20,000 BTC is $80,000,000 as at the time the short bull run came which probably op approximated to $100,000,000, to us, it looks very big, to some, this is just a token compared to what they have stored in their traditional bank, there are so many musicians that are worth more than $500,000,000 not to talk of some very great business men that we have, do you know the total market cap of gold will swallow that of Bitcoin like 70x, these are still owned by people.
So, a man with $500,000,000 in his account might decide to save 20% of it in a bitcoin wallet for future purpose, does that mean he is a whale or the money is meant for a manipulation?