Agreed. They are basically telling the scammer(s) to use a more anonymous & untraceable crypto next time, as everyone will be following the coins in that BTC wallet now, which makes it much more difficult to "launder".

I guess the choice of BTC but the scammer(s) was based on its much bigger popularity relative to Monero (many people have a few satoshis somewhere, but not many have some monero lying around)