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tl:dr: possibly, but if so, it would be the size of the entire universe and, as a result, impossible for us to determine one way to the other.
I didn’t find any ArXiv links in the page, but the main point is this: given how flat the Universe is, if it is inside a black hole, it needs to be really large in order to keep the curvature inside so flat.
This topic comes up from time to time. If you’re interested, check this article by a cosmologist. https://www.preposterousuniverse.com/blog/2010/04/28/the-universe-is-not-a-black-hole/
Is your username in reference to Fast Fourier Transforms?