Thank you for the prompt reply. Really Appreciate it.

What I'm confused about is that, when we arrive and as transit passengers clear security and go to departure level to access the lounge, how do we go back to clear immigrations and customs from the departure level? Is there a clear path for that? Or will some will have to help us navigate against the regular flow?

(I remember at ZRH, for example, even from the departure level there's a way to go to immigrations and customs at the international terminal. Flights from US arrive at the departure level itself. And for flights which arrive from elsewhere you need to clear security and go to departure level from arrival level. But from the departure level you can go out again.)