The KM in 2000 states, " to not make the tract invisible to passersby's".
Though the point made may be partially correct (excepting 'not . . . invisible'), the above is definitely not a direct quotation from the KM; it is by no means copied/pasted. The WT publications would not contain so many errors in a single sentence.
CC
My guess: "[. . .] not to make the tract visible to passersby."