The provider was paid 3,000 by the payor - that's how insurance billing works. It absolutely is a rats nest when it comes to finding out pricing information but the number on the bill is what ended up changing hands (less, possibly, any amount not covered and defaulted on by the patient).
I believe you're thinking of the provider's chargemaster and the pricing discrepancies there - this procedure was billable as 10,000 to a patient without insurance with the 7,000 discount being the payor's preferred rate - that 10k is the BS number that (mostly[1]) no one ever pays, while this 3k is the actual amount changing hands - for the patient the out of pocket cost is the most visible portion, but that bill was fully paid.
1. Mostly everyone except for the uninsured or out of network - those folks will get stuck with that BS price 7k price, which is there since payors always want to feel like they're paying discount prices.
(edit - corrected numbers to be in line with the actual bill)