I cannot verify the source info on the site you have given, but I'm curious about when they collected those inflows and outflows of BTC and Gold. After all, I'm quite concerned that many investments have been going down because people need actual money during the pandemic. It's what has happened all over the world, and everyone is affected. Those four weeks mentioned in the article didn't state when it was recorded, though.
It's definitely good news to hear that big banks like JPMorgan are predicting the future of BTC. I'm not sure if it's just shilling or not but as long as it's positive, right?
Bitcoin has high volatility which gold lacks and the mobility and convince makes it more durable and secured than gold. If the growth and adoption by different institutions continues thriving, gold wouldn't catch up with the pace at which Bitcoin is going.
IMO, it's quite harder to trade compared to BTC because almost everyone can buy BTC and Gold is different. You have to have accounts and verification etc., to be applicable to trade those assets.