Just received feedback from the PLs on this question:
“Pin 4 GND is designed to be the AGND while the other GND pins are PGND. To facilitate the layout, Pin 4 can be connected to Pins 5, 6, and 7 directly.”
Hope this clarifies things. Let me know if there are any additional questions. I will push this clarification to represented in the documentation of this IC.
Best,
Krishan