Roy Kerr has recently written a preprint (https://arxiv.org/abs/2312.00841) in which he strongly argues against the possible existence of singularities inside Black Holes.

I've read that his arguments are really powerful and that he is most likely right.

But, does it mean that Kerr has undoubtedly ruled out singularities?

Do his arguments apply to all Black Hole solutions (for example, do they apply for non-rotating Schwarzschild Black Holes)?

What about the Big Bang? Has he ruled out that there was a singularity in those conditions?

Even more, I've read that his arguments mean that, as there are no singularities, there is nothing wrong with quantum mechanics and relativity applied to extreme conditions such as Black Holes' interiors or the Big Bang itself, meaning that all efforts to find new physics, theories of quantum gravity and theories of everything have been in vain. But is this true? Wouldn't that make Kerr's preprint the most important one in theoretical physics for almost half a century? Shouldn't it have hundreds if not thousands of citations by now and published in the most important journals already?