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Slide.Shapes.AddChart() automatically opens Excel. Even if I quickly do Chart.ChartData.Workbook.Application.Visible = false, it still shows a little while. This makes automating chart creation error-prone as the user has to try not to touch the Excel applications that keeps popping up.
Opening a presentation with WithWindow = false will still open Excel when creating new charts.
This behavior is “by design” and Microsoft is not interested in changing. This is the way the UI functions.
What you could do would be to create the chart in Excel (using either the interop or OpenXML), then import (insert) that file into PowerPoint.
Check this link from MSDN