That article seems to be talking about Wylan, not Brown.
>$1.5 million in stock profits by trading on confidential tips that originated from his brother-in-law, an investment banker in California.
Brown may have violated some minor regulatory laws depending on the specific details of his employment but you generally need to trade, benefit or have reason to think trading is happening on your info in order to get slapped for insider trading.
This article suggests that he may have engaged in conspiracy to commit securities fraud. https://www.latimes.com/business/la-fi-supreme-court-insider...