I am aware of that, but in my opinion it just a useless statistic to display based on the way it works.
There is no point in one for towering guilds, because only like 4/5 guilds are potential candidates for being the 'best guilds' and you could go ask any of them and they will tell you their reason for doing it was for fun and because them and their members enjoyed it, not so they could be plastered on top of an all-time leaderboard. The idea that 1,000 hour guilds are the 'best guilds' to some people is beyond me, especially because it is an easy task and was even easier back then.
There is no competition in an all-time leaderboard for player killing or baddy killing nor is anyone on that list the 'best' because it doesn't take much skill for either of those activities, it just simply shows people who started earlier and played a lot more than others, and while yes, people like Anyu as mentioned before did pass them, but that isn't really something your everyday player is willing/capable to do.
Maybe displaying people with over 500k kills/baddy kills in the library or something would work, but I personally can't see a point in having all-time leaderboards displayed when the seasonal leaderboards that are shown are a much better system and as stated earlier things are much different now, so it would be better to view the all-time leaderboards as past achievements rather than actively use them for competition.