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You're kinda right, but not really. Based on a reductionist definition of a black hole, our universe is inside one.
However, that's strictly based on some of the characteristics of a black hole, and our universe.
However, if we're talking about black holes with more nuance, the answer becomes "no".
I'm not qualified to answer this, but I happen to know someone with a PhD in astrophysics, who has published multiple articles about black holes. We've talked about this before and long story short: we don't live inside a black hole.
The big bang theory disproves it. The existence of background cosmic radiation doesn't match the interior of a black hole; it's geometrically impossible.
Our universes ever growing horizon is out of limits, and we can't escape from it. That's not the sane thing as an event horizon though.