Yes, and in fact you can include 'it' too: It will not find him, though 'he' or 'she' is more logical. Then again, with DL, logic isn't always a particularly good indicator.
If you reported it, they certainly will. I've reported many mistakes and other kinds of imprecision myself and many were later corrected by course contributors.
genoveffa: yes it could be: 3rd person forms translate as "he, she, or it". "It'll" is simply a contraction if "It will..." -- e.g. the sentence could be referring to an animal that won't find something: a treat, a cadaver, whatever.