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I don't think it's even set in stone that we are expanding at all. There is another theory that the universe as we know it could be the inside of a black hole. In this scenario we could actually be shrinking instead - or rather being compressed, if that makes sense.
I think it's pretty well established through empirical observation that the universe is expanding, based on all our current understanding of the universe. We don't know WHY, and we don't understand how, but it's not really under debate at this point as a fact.
What happens inside a black hole is entirely and utterly unknown, and it's such a crazy mind bending concept that anything we theorize is as close to informed speculation as you might get.
I'd heavily take with a grain of salt anything that replaces something we know as well as you can observe with a theory that goes something like "well maybe we're inside a black hole."