Apple has moved these indicators into their “exclaves” removing any control or influence from the OS / software running.
They started in ios14, iOS 17 got new Secure Exclave path that (A18, M4).
Search for “Secure Indicator Light”.
Also searching for “Secure Exclave” will reveal some fun reads.
https://9to5mac.com/2024/09/11/iphone-16-privacy-feature-m4-...
I couldn’t find a more technical article but this was when it was released.