Xbox through an tweet confirms that Players Account Suspension related to BG3 Mature Content was not Automatic.
Recently there was an on-going conflict among the BG3 players with Xbox regarding ban of Xbox account.
Every Clip was revied by an moderator and if it is found in violation against safety and content policy, then only the Players account is suspended.
From the official tweet - "Our team evaluates appeals and can reverse suspensions if action was taken in error. If this was a first offense, for example, we will remove the suspension and let players know why it happened and how to avoid future issues (e.g. how to turn off auto-upload when sensitive content is being captured)"