The page reflects dan ranks awarded by the Nihon Ki-in as maintained by the Nihon Ki-in without any modification. The page notes (in bold) that the numbers include several deceased players. Its not stated definatively because I don't know all the players; I cannot say for certain that all deceased Nihon Ki-in ranked players are included.

I don't maintain a copy of my own of the Nihon Ki-in pages. This page reflects what the Nihon Ki-in lists on its site. Presumably, the same policy will be used for all players as they retire or die. Assuming that the policy will be enforced equally on all, and that all players, both male and female, retire or die, the page reflects dan ranks awarded by the Nihon Ki-in.

If you would like to supplement this material with a count of active male and active female players, I certainly would not object provided that the date was included. Something like "as of such-and-such-a-date there were xx active 9 dans of whom yy were male and zz are female". Doing so will present a smaller male to female ratio than the male female ratio currently presented.

Alternatively, an active player's dan rank table could be presented with date...it will change each year and each time a new player wins a title.