I think that's wrong in the way people usually understand the terms. If you use "quantum physics" to mean the human practices and understanding, yeah, I believe we cannot actually apply those at human scales. (Relativity we can, of course, it just is so close to Newtonian results it's usually not worth worrying about.) But if you use quantum physics to refer to the phenomena that are described by the human understanding, those don't cease to apply. They just get outside our current ability to understand and describe. (Of course AFAIK there's still a problem that we can't reconcile quantum and relativistic descriptions?)The problem with trying to understand the world we live in by looking at Quantum Physics is that Quantum Physics only deals with things on a scale that we cannot exist at, and that ignore the subset of physics that we do interact with in our normal lives.
We do not exist in the near perfect vacuum of the Quantum Universe. We also do not largely exist in the high energy state described by Relativity. We exist, at least 99% of the time, in the subset of reality that is described by Newtonian Physics. We do not experience such speeds as to warrant Einstein's corrections, unless we are astronauts traveling beyond our atmosphere. We are affected only indirectly by Quantum phenonium, and that mostly in the use of transistors. We pretend to understand the larger and smaller Universe our subset of reality exists in, but all we can only use math to describe what our instruments tell us, for we only truly perceive the Universe as Newton described.
The forces that bind our molecules together makes us solid on the level that we can perceive. We are told that we are in fact mostly empty space, but in fact we are made up of the mass that is within that space, and that mass can be measured with a simple scale and acts like it is largely solid from our perspective. The forces that act upon us in ways we can detect are known and measurable, and by those measurements are also predictable based on what effects they impart.
Science is also known as Natural Philosophy, but some philosophies it has spawned have little if anything to do with the natural world that we live in, only the portions that we cannot directly interact with. While several interesting discoveries and developments have come about from delving into those realms, it is important to remember that we exist in the portion of reality where Newton's equations are as accurate as most tools used for measuring the data used to fill those equations in.
Now, all that aside, any predictions for how many of Jerry's co-workers will need medical or psychological assistance in the near future? After all, unlike odd philosophies about the underpinning of existence, what is happening in Oxford in the story is actually relevant to the story, would you not agree?
Also, the quantum stuff is intensely relevant to our basic makeup on scales that modern humans do interact with fairly frequently. People are made of fancy chemistry, and the components there are at the scale where stuff gets very overtly quantum.