Uh-huh. And ‘signed zero’ much like anything we use to model reality, is a model of reality – not the reality itself.
0 is 0. There is no such thing as +0 and -0. Just because we can make an algorithmic mathematical logic system that can model +0 and -0, does not mean those concepts exist. The concept of flat Earth is a concept, and it doesn’t exist either.
Sure, there are computer models that differ – but they are just models. They do not reflect reality.
(A general aside about science; they don’t call astronomy “telescope science” – but they do call information science “computer science” … the computer is just a tool that a scientist in that discipline uses; it is not the be-all-end-all truth. Telescopes aren’t what define stars. Computers aren’t what define information)