Why should it be 'deduced' if they were the accident investigators and had all the specs.
Because having the specs doesn't equate to providing evidence of a failure mode, or ruling out a failure mode, by collecting actual data from the device via subsequent test procedures. If the device is switched off, its battery is fully charged, and its transmitter is in working order -- all things that require additional tests -- then the conclusion supported by the evidence is that no failure mode is evident and the device was never activated. To be fair, that's inductive reasoning for the part where the conclusion is arrived at. But the deductions along the way are that the test procedures establish facts from which a conclusion may be rigorously drawn.
One can deduce that if power is applied to the transmitter, a suitably functioning transmitter will emit a signal at its prescribed frequency. One can deduce that if a battery is measured to contain a certain charge, it will apply that charge to its output terminals via a suitable circuit. One can deduce that if a switch exists in such a circuit, closing the switch will allow current to flow and energize the other parts of the circuit. These deductions are informed by knowledge of the device specifications, but do not substitute for testing those deduced observations. If the deduced actions do not result in the expected observations, then one may infer the presence of any of a number of failure modes and conduct further investigation to isolate it. However, the correct operation of the device when appropriately activated carries those deductions into the realm of proven fact.
What you are really saying...
No, what I'm saying is what I actually said. Stop putting your words in everyone's mouths.
I honestly can't believe you had the audacity to portray yourself as 'King Scientist'.
I never did any such thing. Unlike you, however, I do have extensive experience in the design, manufacture, and testing of engineered products, and experience in the forensic determination of failure of those products. You're the one trying to tell everyone what should or shouldn't have been done when you have no relevant knowledge or experience, and explaining the difference between your expectations and those of an expert in terms that insist you must be right and the expert must be wrong. And then accusing the expert of being audacious for disagreeing with you.
Your ego is the only reason this thread is nearing 300 pages in length.