So then, if we are not infallible, is the instrumentation and controlling for biases in listening tests infallible? Nope.
That's a strawman. It's not simply that our ears are infallible - it's the specific ways our perception is fallible. Instruments can both detect things we can not hear (or see), and also detect things we can hear, but more reliably. Nobody has to claim objective measurements are "infallible" in order to point out that they are in many ways more reliable (and more sensitive) than our hearing. Why do you think humans invent measurement tools in the first place? To extend beyond the power of our limited senses, as well as to gain more reliable results.
Our ears are the most objective tool we have...
It would hard to come up with a more "wrong" statement than that...
Again, you seem to be ignoring that our hearing isn't merely our "ears" but is ultimately an interpretive process via our brain.
Also: ever had your hearing tested? You will in all likelihood have variations in your frequency response, and of course your hearing will drop off well before you can hear what the tool is actually playing. Tools really can play, and detect, things your hearing can not.
