well as some have already said, in the article they didn't talk about bitcoin specifically, they're just talking about cryptocurrencies (in this case there are 3 cryptocurrencies), talking about cryptocurrencies and money laundering, I think for very smart people they didn't use bitcoin for this type of crimes, it would be a serious mistake that they would be committing, using Fiat is the best option (of course I'm not encouraging this type of crime, I'm just saying that between bitcoin Vs fiat the best option is fiat ), in my country for For example, criminals keep kidnapping people and kill people and create stores and various businesses in order to justify the origin of the money, these criminals use fiat
If that is the case then fiat is still the option that the criminals, I mean there is no satisfaction for this kind of people by seeing tons of paper in front of them and feels very happy about it.
But laundering is another thing, and yes there are a lot of way to hide and wash everything. And unlike crypto, it will take a lot of effort, so this is not a good choice of criminals as it will just make things complicated for them. Just the usual, creating business up front or using heir existing already to hide the dirty money.