In this transaction, there's only 0.00291948 BTC sent to the scamming address: bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh.

It's time to learn more about Bitcoin. :)

Wait, where do you see that? On the linked page, I can see the following:

Total Received: 11.39184745 BTC

edit: OK, either this is strange or I don't understand how it works.

You’re fine. The GP doesn’t understand. Only 0.00291948 BTC was sent to the hacker wallet. The remainder went to other wallets. The vast majority went back to the person making the transaction (IE nowhere)

What is the point of someone sending btc back to himself?

That's just how Bitcoin works.

Say you have 1 BTC on an address and you want to send 0.1 to someone, you still need to send all of the money. So wallets "split" the 1 BTC into 0.1 and 0.9 outputs, sending the 0.9 to yourself to another address you control. It's called a change address.

Modern wallets do this automatically, but it can be confusing to look at it on a blockchain explorer.

It’s like paying for a $3 latte with a $50. You need to get your change back.

Yeah, I also don't understand how one can have multiple destination addresses in a single transaction.

As a a sender, you have a coin of amount X, and you split it up and send it wherever you like

If your coin is 1 and you want to send one person 0.2 and another person 0.3, you can do that as a single transaction to three destinations, one with 0.2, another with 0.3 (to the people you’re sending to) and a final one with 0.5 back to one of your own addresses (aka a change wallet)