yes it is really there and the devs have shown in the past the area is walkable but only by dev magic. I dont believe there is any intention to let people go down there and the detail is very basic from what i have seen and heard.
I guess depending on how they built it, perhaps they can add a transporter pad and improve the area later on.
at least at the moment its simply there to 'look pretty' and to complete the look of new romulus. they cant just paint it in so to speak so they have to physically build it. its like the city walls. you cant technically enter the city but you still need to have some visuals there.
If "Season 8" really is going to be the release of a Romulan faction, I wouldn't be surprised if New Romulus is the starting point and Romulan faction players would be the only ones to access the Reman Quarter.
New Romulus is not the new capital of the Empire. It is a bunch of Romulans and Remans that decided to leave Romulan space so they they don't have to worry about the current chaotic state of the Romulan Empire.
Why? New Romulus is the new capital of the Empire, only makes sense. Only other viable options I could think of is Rator, the Vault, or maybe bring back Romii and make Iota Pavonis viable.
Nooo... New Romulus is the capital of T'Dans group. The mission "Cutting the Cord" hinted that the Brea System had become the new headquarters of the Romulan Star Empire. Sela and Hakeev were there after all.
A Vault adventure zone though... now THATS an idea!