The corresponding functionality appeared in the new beta version of the messenger.
The WABetaInfo portal writes that in the new build of the WhatsApp application for Android with the index 220.127.116.11, there will be functionality that gives group administrators the right to delete messages from other members. The innovation is Admin Delete and is currently unavailable to all beta testers. However, some lucky ones can try out the feature even without installing the said version of the client through the Google Play Application Testing program.
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You can check the availability of such an opportunity by holding your finger on any message in your group. If after that, a dialog box appears with a Delete for everyone button. When you click it, instead of the message, the inscription You deleted this message as admin (“You deleted this message as an administrator”) should remain.
It is not worth waiting for the appearance of this feature in release versions shortly. Despite its wide popularity, the messenger is in no hurry to implement many seemingly apparent parts of the functionality.