How does Kia Measure Battery Degradation for Warranty Purposes?

Does anyone know how Kia measures battery degradation for warranty purposes? The Canadian warranty for my 2020 says:

"The Lithium-Ion Polymer Battery ("EV Battery") Capacity warranty coverage period is 8 years or 150,000 kilometres from the Date of First Service, whichever comes first, for capacity loss below 65% of the original battery capacity. "

Is this based on some diagnostic readout?

Oh and this is weird. I downloaded the Kia Niro EV warranty pdf and the text, when I read it in firefox says what I've quoted above. If I copy and paste the text from firefox, I get this:

"The Lithium-Ion Polymer Battery (䳖EV Battery䳗) Capacity warranty coverage period is 8 years or 160,000 kilometres from the Date of First Service, whichever comes first, for capacity loss below 70% of the original battery capacity."

Notice that the distance and percentage are different. Weird.