A black hole's interior is layered like an onion. In the new model, instead of an infinite point at the center, there are three regions: a dense core, a transition layer, and a crust just below the horizon. All arise from a single field that interacts with itself.
The crust consists of massive thermal excitations with positive energy. Between them is a thin transition layer where matter density is maximal and gravity almost vanishes. The whole structure is held together by Einstein's equations and stitched via Israel's junction conditions.
A negative temperature on the Kelvin scale is hotter than an infinite positive temperature: if you bring a body with negative temperature into contact with one with positive temperature, heat flows from the negative to the positive.
A similar layered world with reversed time flow is described in Greg Egan's novel 'Schild's Ladder'.