Yes definitely, it was only available if you completed 10 reviews on the tribunal.
Back in the day, chat reports were submitted to the tribunal and players could review them and issue judgement (Basically submitting them to Riot for further review/ban) players could not directly ban other players.
You were rewarded with a small amount of IP (Blue Essence) for doing this. A promo was ran to get more people involved where if you did 10 reviews you got Judgement Kayle.
Super cool and rare skin, but a lot of people who played at that time likely had it so whilst it's rare to see there are likely thousands of old accounts out there with it that have not been logged into in years.
A judgement Kayle account is about $15 on G2G, they are in abundance unlike Season 2 Riven or something.