Thanks Chang! I've read that student project report. Actually I think that their understanding and statement on it are not very accurate. So don't be mislead by that school report.
If you search around, you'll find that most of the term "deglitch" in the field of class-D comes from the datasheets of TI. I debt the deglitch block in their products are not for avoiding shoot through 'cause that block is controlled by the internal oscillator (pls check TPA2000D4). As far as I know, you don't need that control signal to introduct dead time.
In my opinion, the deglitch logic could be simply implemented by a schmitt triger to clean up the PWM singal. But why using a control signal?