Note that weird stuff is overrepresented in press articles. This is a cutting edge theory, nobody is sure if it's correct or it's a silly speculation. But it has some weird angles that make clicky press articles.

Most physics is boring and technical.

In particular there are a lot of applications of Quantum Mechanics to Chemistry and Solid State Physics (for example transistors). Even weird stuff like superposition change the properties of small molecules that are easy to test in the lab and simulate in computers.

And there are even more weird stuff that mix Quantum Mechanics and Special Relativity, and has effects in Chemistry that are easy to test and Particle Colliders that are also heavily tested.

The problem is trying to mix Quantum Mechanics and Special Relativity. We don't know how to do that, but (un)luckily in (almost) all experiments you can choose to use the QM+SR approximation or the SR+GR approximation.

I'm a postdoc in theoretical quantum optics. The answer is: both all of it and a none of it. All of it is real in the sense that Quantum Mechanics has been aggressively and extensively tested against measured observations of reality and has not yet found a discrepancy with it. None of it is real in the sense that it is all a mathematical model that is supposed to make predictions about reality.