Does divorce occur by the husband's statement to his wife online, "You are not binding on me," knowing that the questioner's daughter read this message?

Your daughter's husband's written statement: "Your daughter is no longer binding on me" is an كناية (allusion or indirect statement) of divorce. If he intended divorce by it, then one revocable divorce occurs. If he did not intend divorce by it, then nothing occurs, for the determining factor in written divorce is the intention.