The information being conveyed is the same :line and :column metadata conveyed by LispReader — in fact, that's where it comes from in the first place.
Kibit (and cljx) is essentially an out-of-band source transformation tool. Given an input like this:
(defn ^:clj system-hash
(defn ^:cljs system-hash
…it produces two files, a .clj for Clojure, and a .cljs for ClojureScript. (The first code listing in the ticket description is the former.)
However, because there's no way to transform Clojure code/data without losing formatting, anything that depends on line/column numbers (stack traces, stepping debuggers) is significantly degraded. If LispReader were to defer to :line and :column metadata already available on the loaded forms (there when the two generated files are spit out with *print-meta* on), this would not be the case.