I get that part, but suppose the current level of understanding red-shift is not fully known, perhaps based on information from the JWST causes a change in that understanding.
Back when Neil Armstrong walked on the moon, who would have thought the JWST would exist.
In this instance, there may be two objects, one in front of the other, of similar shape and size in the JWST field of view, so that their light may interact. One being much closer than the other, but both being red shifted by a large amount................Just a guess....................