Trader "Frogman" wallet was drained for $4 million while he was sleeping after attending the TOKEN2049 event in Singapore.
The first question: which wallet did he use?
Nine tokens were stolen, swapped into ETH, BNB and SOL, then moved through privacy tools.
If this is the "Altcoin Discussion" section, you really should have at least specified which Nine tokens these are, don't you think? Otherwise, this topic doesn't belong here.

Maybe it would be better in the "Trading" section?
He checked his phone and email;
A phone? Does that mean his app-based wallet was installed on his phone? Or, since he’s a trader, were his crypto assets held on an exchanger? If it involves an email. Then which one exchanger? And isn't it reckless to keep $4 million worth of crypto assets on an exchange (which is the most likely scenario here), even for a trader? All in all, there are a lot of gaps in the story.
By the way, did you notice? The hackers left a bit of money for "Frogman"'s pocket expenses?
there were no signs of hacking. He doesn't yet know how it was hacked.
If there were no signs of a hacking, then perhaps there were no hackers (or a hacking) at all? I don't want to jump to conclusions, but right now the story looks a bit "fishy".