Matter would have escape velocity but not light. Gravity does not effect the C speed quantity Light emiited inside would still be moving outward at C.
The original lie for General Relativity at its extreme is now out in the open. Space contraction ruled out black holes the first time they were looked at. Einstein knew better. He didn't go along with complete collapse singularity. But he was not equiped to correct his new theory. The correction is limited strength curved space.
There are no boundaries in space even local as in a black hole boundary. There are no universal boundaries local or hypersphere universe.