Kaiser EOB: what does "plan allowed" even mean when the provider was Kaiser

I've got Kaiser insurance, purchased direct from Kaiser.

I see a Kaiser doc, or get an injection or blood draw in the Kaiser lab, all done by employees of Kaiser.

So what's up with the nonsense on the EOB about "provider billed" "plan allowed" "plan paid"?

These providers are employees of Kaiser. The plan is a Kaiser plan. Ain't nobody in this transaction but me the patient and a bunch of Kaiser employees.

I don't think they are making up their own rates for procedures just to watch and see what the plan allows. Why go through this dance? What significance does it have to anyone?

Is it all a tax dodge of some sort? Kaiser crowing about how much care they wrote off as charity and getting a credit or something for this fabricated discount?

When I go to get my car fixed, I don't get a bill that said the mechanic wrote down it would be $500 but the shop owner only allowed $400.