The theory requires a very minor modification of Hawking's original idea, which was slightly wrong. There is a good link to the explanation at the web site of this article.
GR and Hawking Radiation are still intact. No worries.
Either way, I dont see how entangled particles on either side of an event horizon violates the entanglement.
The entanglement is violated because the particle that falls into the black hole in annihilated, leaving an orphaned partner. The resolution is that Hawking particles are spawned in entangled pairs of pairs. [Four particles.] In each case the entangled particles fall in, or escape together.
Like a double date, where you go into a bar and get so trashed you wake up in a strange bed, but it's the gal you went in with in the first place, so no "fire wall" to deal with later on...
Oh yes, you’re correct. The particle within the event horizon acts like negative matter in order for conservation of energy to be preserved. I missed that little nuance.