Earlier quoted context omitted.
You sound like you think they were lying.
Personally, I don’t, but I was trying to convey a neutral stance. That said, I didn’t like their approach of secrecy and, at least seemingly and anecdotally, doing it when receiving updates rather than over time based on some metric such as battery cycle count. I find this possibly related to their anti-repair practices.
Updates are how they deliver updated battery management algorithms, not the metric they use to determine battery age.