Sure, but you don't tumble it all at once. Other commenters showed that these BTC were split up into ~1000 BTC chunks. Each of those could send randomly to diff

Sure, but you don't tumble it all at once. Other commenters showed that these BTC were split up into ~1000 BTC chunks. Each of those could send randomly to different tumblers and anonymize all of their activities to send to a new set of addresses which people aren't tracking, and then from there gradually pull it out of various exchanges to various banks and accounts.