From the article:

Legal experts say any such suit would have virtually no chance of success, given serious jurisdictional, procedural and substantive problems.

On the substantive point: These kinds of shareholder suits are typically brought when members of a corporate board engage in self-dealing or fail in an oversight duty when the corporation has seriously violated the law. In this case, AB InBev merely made a (completely legal) marketing decision, in an attempt to expand its customer base. The strategy might have backfired — again, because of the anti-trans animus of people such as DeSantis — but that doesn’t mean the board somehow breached its fiduciary duty