About updating business information for WhatsApp Business accounts linked to a Facebook Page
When you connect your WhatsApp Business account to your Facebook Page and turn on syncing, your WhatsApp Business account will reflect the business information on your Facebook Page.
However, unlike WhatsApp Business, your Facebook Page may have multiple editors or admins. All Page admins and editors will be able to update the business information on your Facebook Page, which will then show up on your WhatsApp Business profile.
However, changes made on the WhatsApp Business app won't reflect on the Facebook Page, even if the accounts are linked.