https://www.bnnbloomberg.ca/the-mystery-millionaire-who-haun...
What's not being said here is that for the trader to have timed his bets so precisely, the reporter would have had to tell him when the story was coming out.
The anonymous sources on Bloomberg M&A scoops all have insider information one way or the other (think "provider of professional services in the deal space"), otherwise they would have nothing to say. While many of them are not stupid enough to trade on that information, nearly all of them get some kind of benefit from it, usually in the form of two-way information exchange with the reporter. Since they work on deals, they want to know about deals, because their livelihoods depend on deal flow.
VCs know this dynamic well, but they are far less regulated, because they primarily work with private companies, not public ones.