Quite a large number of the listed moderators appear to be inactive based on their post histories, i.e. not interacting with anyone or anything for months or in some cases years. Moderator hierarchy is strictly linear on Lemmy. You can remove anyone who was made a mod after you but your account is subordinate to any mod who held the position before you. Inactive moderators who were promoted before any of the current crop therefore can’t be removed without administrator intervention and it’s likely that A) no one can be bothered, and B) if there’s no compelling reason to kick them due to misbehavior or anything it might be impolite to do so in case they ever feel like coming back.

• @VerbFlow@lemmy.world - Last activity 3 months ago
• @BigMikeInAustin@lemmy.world - Last activity 8 months ago
• @drmeanfeel@lemmy.world - Last activity 2 years ago
• @pavnilschanda@lemmy.world - Last activity 1 year ago
• @CriticalMedicine@lemmy.world - Last activity 2 years ago
• @WonderfulWanderer@lemmy.world - Last activity 2 years ago
• @Mastengwe@lemm.ee - Account apparently deleted
• @Communist@lemmy.ml - Last activity 2 years ago
• @Soup@lemmy.cafe - Last activity 1 year ago
• @iAvicenna@lemmy.world - Last activity 8 months ago
• @corus_kt@lemmy.world - Last activity 2 years ago
• @Prandom_returns@lemm.ee - Account apparently deleted
• @JimSamtanko@lemm.ee - Account apparently deleted
• @TheFriar@lemm.ee - Last activity 1 year ago
• @ArmokGoB@lemmy.dbzer0.com - Account apparently deleted
• @HawlSera@lemm.ee - Last activity 1 year ago
• @andrew_bidlaw@sh.itjust.works - Last activity 8 months ago
• @MeDuViNoX@sh.itjust.works - Last activity 1 year ago
• @Nougat@fedia.io - Last activity 9 months ago
• @glowing_hans@sopuli.xyz - Last activity 11 months ago
• @ThefuzzyFurryComrade@pawb.social - Last activity 3 months ago

Given the nature of the subject I imagine it’s also probably a high turnover position.