There is no need to guess. The authors explicitly stated that "an observation produces the property observed" (your long-winded diversionary tactic notwithstanding).
Do you know what we are capable of observing when we measure/observe quantum systems? Are you aware that an "observable" in quantum mechanics isn't a physical property but a Hermitian operator? Can you tell me anything with respect to how I might prepare a "quantum system" and measure it such that you can tell me precisely what the nature of measurement/observation produces?
To make this simple, if I am interested in the speed of a car, the velocity of a bullet, the mass of an elephant, etc., all these "observables" directly correspond to the values I am interested in. If I am using a radar gun and I clock some individual in Dodge Challenger or a Ferrari as going at a speed of 100 mph, the value of this "observed" quantity is the quantity: that's how fast the car is going.
In QM, you cannot do this: ever. You can never, ever obtain any value that corresponds to any measurable property of any system. You represent these properties before you even measure them by mathematical functions (you might add this, while your at it, to the list of things you've been wrong about). If you would like me to provide you with questions that actual physicists (or even would-be physicists in grad school or something) have to answer so that you can show you are aware of what it means when "an observation produces the property observed", I'd be more than happy to.
The authors explicitly stated that whenever they use the term "observation" that consciousness is lurking.
Yes, they very clearly state that photographic film are conscious. Oh, wait, they don't. Moreover, as observables in QM aren't properties of any system whatsoever, you produce them mathematically. If you would like to compare your source which starts out with the claim that it is controversial and doesn't in any way remotely address quantum physics as physicists use it and just barely scratch the surface of how some understand it, then would you be wiling to answer some standard questions that an upper-level physics undergrad could probably answer regarding observation using QM?
Why? Because mathematician John von Neumann demonstrated that "an ultimate encounter with consciousness is inevitable" whenever a measurement is taken (your long-winded diversionary tactic notwithstanding).
1) It is impossible to demonstrate that consciousness encounters anything when there is no agreed upon definition what this is (or if it exists) among those who actually study consciousness (unlike von Neumann) or amongst scientists.
2) Granted that we are conscious, obviously whenever we try to observe or measure our conscious state is relevant, because we're the one's observing. This is no more meaningful than to (correctly) assert that the encounter of solar magnetic flux with galactic cosmic rays is inevitable and non-trivial. Whatever half-baked understanding you possess of quantum measurement, you may wish you look into the measurment problem for context here. Because it is this problem which makes it particularly relevant for us when we make measurements, not because our consciousness does anything whatsoever, but because all the other infinite interactions that do the exact same thing involve systems that are inanimate and couldn't give a crap whether or not their interaction changed the state of the system.