LE only rarely says they've "cleared" somebody, because until there's a conviction, they can't be sure there won't be new evidence that changes everything. They can only say that "at present time *advertiser censored* isn't a person of interest", or "there's no evidence linking YYY to this crime," or sometimes reference to extenuating circumstances, like "ZZZ was elsewhere with 20 witnesses at the time."
Also, contrary to popular belief, there is no requirement that they name a person of interest, or identify them publicly if they do have a suspect.
Saying nothing about this particular case--just a general observation about procedure.