No what the guy told me is that they can't replace batteries because of lack of repairability. So their "battery replacement" is really a full device replacement (even though my device is otherwise in mint condition), and therefore they won't do it until their own diagnostics tell them the battery is dead. And of course I found lots of people sharing the same experience on forums, their diagnostic tool is set to never tell them the battery is dead.

Apple does replacement but if the iPad is on the obsolete list then they won’t.

I don't think I have a battery health in settings. The apple store guy ran some sort of remote diagnostic (and there is no way it is at 100% after 4 years of daily usage).

My point being that you can't really change those batteries on demand.