To be honest, the article seemed a little click-baity – but it sounds cool, and introduces some interesting scientific ideas to play with (such as the math of a black hole possibly looking like the Big Bang in reverse), Schwarzschild cosmology, etc, but ultimately comes to nothing, as you point out. Unresolved, and probably unresolvable. Still, fun to think about as one of many crazy existential possibilities.
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.
To be honest, the article seemed a little click-baity – but it sounds cool, and introduces some interesting scientific ideas to play with (such as the math of a black hole possibly looking like the Big Bang in reverse), Schwarzschild cosmology, etc, but ultimately comes to nothing, as you point out. Unresolved, and probably unresolvable. Still, fun to think about as one of many crazy existential possibilities.