I know I'm supposed to have 'suspension of disbelief', but I just couldn't when it came to
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Amanda/ A.R.G.U.S having tech that blocked Kelex's sensors
I mean,
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Y'all saw the size of that thing?
Also, 'trusting' doesn't make someone naive or stupid, especially when you're as experienced as Superman and know how wary you have to be of the person you're 'trusting'.
So, with that last page, I'm kind of flipping it:
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Superman (and Kelex) knew about the device and allowed Waller (and the others) to believe it was (effectively) 'invisible' to Kryptonian tech and Kryptonian eyes, so as to allow Amanda to go ahead with whatever so they could get the intel they needed.
YMMV