Thanks for your interest in Aspose.Slides.
I have observed the presentation file shared and the table that is being added is not a table but a Word document Ole frame. Aspose.Slides allow you to extract the presentation text but not the Ole frame text. In your case, you need to access the Ole frame frame data and load that using Aspose.Words and accecss the text using Aspose.Words. Please visit this documentation link where by you will find the sample code for accessing the Ole frame and saving to excel file. In your case, you can save to word file. Please share, if I may help you further in this regard.