The problem discussed in the article was NOT insiders trading on secret information — it is the nearly opposite problem of manipulators trading and skewing the odds.

Insider trading seeks to trade with secret information and minimally obvious trades to avoid moving the markets until their position is locked in, in order to profit when the previously secret information becomes public and the market finally moves to a different price level.

Manipulators seek to move the market to create a false narrative that market-moving info exists when actual market-moving does NOT exist; the expectation is that people will see the price change and ASSUME there is information behind it, when there is actually just a manipulator willing to lose money to create that impression.

In a small market, such manipulation can be more cost-effective (make more of an impression for the same cost) vs buying advertisements.