I have observed your requirements and like to share that it is not an issue and nor it can be set using Aspose.Slides. In fact Microsoft PowerPoint display such text for user convenience in case if there is no text assigned in placeholder.
The workaround that I can suggest in this regard is that you may access such placeholders and set text by giving some blank spaces. This way when you will open the presentation in PowerPoint, there will be no such message.
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