Sorry for the late response.

Actually I still consider it impossible. Hawking radiation involves the creation of photon pairs just outside the event horizon. Most pairs get absorbed. But a fraction of them have an outward velocity component v < c, the speed of light, such that the photon at outward velogity v can escape the black hole. This is Hawking radiation.

Right at the event horizon even those photons with an outward velocity component v equal to c get captured by the black hole.

The above paper claims that photons going into the event horizon bounce off of it. No way.

Richard