Straight from the MLB policy, he can only be suspended for something that falls under:
Domestic violence: is a pattern of abusive behavior in any intimate relationship that is used by one partner to gain or maintain power and control over another intimate partner. It occurs in heterosexual and same sex relationships and impacts individuals from all economic, educational, cultural, age, gender, racial, and religious demographics. Domestic violence includes, but is not limited to, physical or sexual violence, emotional and/or psychological intimidation, verbal violence, stalking, economic control, harassment, physical intimidation, or injury. Notwithstanding this definition, a single incident of abusive behavior in any intimate relationship, or a single incident of abusive behavior involving a female member of a Player’s family who is domiciled with him, may subject a Player to discipline under this Policy.
Sexual assault: refers to a range of behaviors, including a completed nonconsensual sex act, an attempted nonconsensual sex act, and/or nonconsensual sexual contact. Lack of consent is inferred when a person uses force, harassment, threat of force, threat of adverse personnel or disciplinary action, or other coercion, or when the victim is asleep, incapacitated, unconscious or legally incapable of consent.
Child abuse: is any act or failure to act on the part of a parent or caretaker which results in death, serious physical or emotional harm, sexual abuse or exploitation of a child who is under the age of 18 or not an emancipated minor, or any act or failure
to act which presents an imminent risk of such harm to such a child.
This policy covers acts of child abuse, domestic violence and sexual assault (together, “Covered Act”) as defined above.
Obviosuly cannot be under child abuse, so he's clearly being suspended under an interpretation of either the 1st or 2nd definition