Sorry, but that's wrong. Relativity has in no way been discredited by quantum mechanics; it's alive and well. Moreover, this Indian chap gets his relativity quite wrong.
OK, superceded, particularly as it applies to Hawking's discussions of black holes. Einsteinian black holes are absolute, singularities. The radiation that "comes out of" black holes via the proposed Hawking radiation requires Quantum effects that are not contemplated in Einstein's theories.