Moneylaundering is a bit more complicated than buying a business and losing a ton of money. The way that breaking bad explains it is acctually not that bad. Fellow buys a car wash and fakes a profit on it by registering sales that never happened. When this is done the business generates a registered and taxed profit that he can then withdraw to spend on his personal needs or reinvest. Promoting boxing shows that register losses doesn't launder any money since no profit is registered and nothing can be withdrawn from the operation as clean money. On the contrary, when setting up an operation that only loses money you are acctually exposing yourself to audits that would ask the question "where did the cash for the startup costs come from". It's well possible that probellum or Kinhan or one of the fellows you guys mentioned is laundering cash but they aren't producing any clean laundered money from shows that they register as having been run at a loss.
That depends on a few things. The PPV numbers and crowd estimates on social media aren't what gets put on their tax forms. Perhaps come April this event will have been a whopping success with lots of last minute cash ticket sales. You can also be running multiple schemes at once, fleecing an investor and doing your laundering at the same time. In this situation profits might get booked by subsidiaries handling concessions, marketing, etc. A third possibility is the event was such a flop even drug money couldn't bail it out. Criminal schemes go sideways fairly often. A funny example off the top of my head, an insider trader who lost millions and still went to jail: https://www.nytimes.com/2009/10/21/business/21insider.html
I would think the money would be in an escrow account and then distributed from there. Once it's there all parties can see it. Plus, unless the fight falls through, it's very difficult to pull the money out.
Apologies I should mention. The ticket sales on books are reported as selling a hell of a lot more. Plus the free YouTube outlet also reported paying license fees. Said YouTuber is No on the no fly list in the US the same as Tyson only fight in the UK fury