The terminology might be a bit confusing. The Qin mausoleum is a fairly large complex that mimics the layout of the old capital city Xianyang. There are many structures in this complex, including the resting place of the emperor himself, and the outer armies statues and other ceremonial structures.

Archeologists distinguish between the emperor's tomb, which is the resting place of his body, vs the rest of the complex, which is generally called the mausoleum or the necropolis.

They have excavated parts of the necropolis and seen the damage this caused, and so they have not excavated the emperor's actual tomb. There's a whole half of the necropolis which they are unwilling to touch because they don't know what their archeological process will do to it - contemporary reports said that Qin had a relief terrain map of the whole empire set up with liquid mercury filling in for the rivers and lakes. Modern excavation techniques are still not up to the task of preserving this.

The commenter you responded to might have been using that distinction: they hope to see some day when our science is advanced enough to examine Qin's personal resting place, amidst all its riches and ceremonial finery, without destroying it.

And there was a moat of mercury buried as well. So that's probably a bit dangerous.