If I’m not a guest at the hotel can I still chill and check out the rooftop pool ? meaning if it’s open to the public not just hotel guests haha

Yes, you need to go through a large bouncer though

Yes. Separate entrance (with a bouncer/security) though for folks who aren't hotel guests.

Lounge Bouncers sound intimidating. May I enter through a passage that doesn't involve intimidation?

The rooftop bar is reached via a discrete elevator to the north of the main hotel entrance.