This is how whales operate. First they tell you "it's a scam", then they say they regret saying so. That's exactly what Jamie Dimon did. They create dips thanks to their power in the media, then they buy the dip, then they buy tip, then they create FUD again, short it, then buy it at a higher floor than before.. and this is how they accumulate.
Whales know they can't kill Bitcoin, only slow it down, so the only thing they can do to keep being at the top of the pyramid long term, it's to have more Bitcoin than the rest of the population. How they do this? like I said, they scare them so they sell them their coins, then they let it grow later.