If Z doesn't exist in reality it can't be observed in reality
I disagree. You can observe mentally anything you can think of. Observation is not just a physical process but also a mental activity.
"The MINIMUM it takes for ANYTHING to EXIST is for you to SIMPLY think it, therefore, be extremely careful what you think and say." (Open System Law of Existence) - Old Toad Proverb
"Say as little as you have to until you have to and when you do have to speak, be meticulous with your choice of werds and how you say them." - Zeroth Rule of Law/Life
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