Not quite. They were throttling CPU performance when battery performance dropped below a certain level. Without that, the phone would just randomly crash instead, so the idea was to give users a softer landing.
Stupidly, this feature was unannounced and not at all user configurable. All users could see was the throttling. And presumably the phone’s inability to hold a charge as long as it used to, though I doubt many people would connect the two phenomena (I doubt I would have).
After the kerfuffle, Apple launched the battery repair program. I think the throttling is now a user-configurable option, but not sure about that part.
