As of yet, no-one knows, but it is a possibility.
No as it was destroyed by trillions of sentinels
^But, the Micro-Dyson Sphere was left intact, so the possibility remains.
No because the micro-dyson sphere was only a few meters across and was in slipstream space,
and showing that there were stars in the teaser( there is nothing in the visable spectrum to see in slipspace)
its clear that this is another forunner instolation.