from other comments i learned that requester and fluid/fuel depots internally are based on assemblers and not chests, but clearly don't "use up" the drones. thus the shown numbers follow some logic, but can't be taken seriously: you won't use up 100 drones and 5k steam to produce10 fuel :-)
also : fuel depots are not filled by drones, but by pipes, and then the fuel is delivered by drones to the requesters.
.1. there currently are 4 drones in that depot, and the limit for the number of drones in a depot (also in mining depots) is 100 (or more because of some bonuses). that's probably why "4/100" is shown.
.2. with drones, transported fluid amounts are based on barrels which have a stacksize of 50. with the shown 10x fuel this might correspond to the amount a normal drone without bonus would transport (10x50=500), and the amount of 5k steam might relate to 100x50 (drones x stacksize). in contrast to vanilla factorio which has detailed info about many details of machines and recipes, modded entities often show "silly" things when they achieve their goals by using quite some different prototype to base a machine on (in this case an assembler to simulate some storage of drones and fluids).
this is also the reason why provider depots (based on chests) easily and directly can be connected to the logistic network with a wire, but not requester depots (based on assemblers), and why you have to be careful when using factory planner or similar mods which think that the requesters produce millions of items instead of being ignored like chests :-)
.3. for me it is good enough to know that a normal drone without capacity bonus will transport (depending on stacksize) 50/100/200/500/etc solids, or 500 fluid, and that requesters are filled to this amount times the number of drones that are home at that requester, possibly overshooting that goal by up to one such load for a total of 1-6 to 2-7 stacks per drone, and that depots have a specific fixed amount of storage (100 stacks for solids, 10k? for fluids/fuel).
thus 4 drones without bonus would try to fill a solids depot at least with 4x50 ore or 4x100 plates or 4x200 wires, and "overshoot" that goal by up to one load, resulting in 300-600 ore for one drone with max bonus, 300-350 ore for 6 drones without bonus, and probably similar also for fluids and fuel.
