I didn't say LIGO was not human centered, but that the gravitational waves which LIGO detected are not human-centered.

I just don't think your take is equivalent to the OP's claim. Yes, our instruments are human-centered because humans are the observers, and so phenomena outside of our perceptual range has to be projected into our perceptual range. That doesn't imply that the underlying phenomena are human-centered, or that the theories formed from those observations are semantically human-centered (syntactically they are because humans have to be able to read them).

I frankly don't even understand the OP's claim: how does the proposition "this is a universe where everything can be empirically tested" logically entail "this universe is human centered". I can agree with being suspicious of the claim that we can empirically test everything, I just don't get how that entails human centeredness.