If we’re really being pedantic, that’s technically true about everything. For all you know you’re hallucinating me right now
No, it’s different. With you, there’s at least something that we observe that we might be hallucinating.
With worm holes, we’re taking mathematical equations that were modelled to reflect what we’ve observed of reality and then we’re pushing them to extreme cases where they’re likely to not anymore model reality correctly, and that is where we’re seeing the theoretical possibility of worm holes. No one has observed nor hallucinated worm holes.