That's why many ThinkPads have physical covers over their cameras. You don't even need to worry about whether the LEDs are hardwired - relying on any electronic indicator is already a half-baked security measure. If you want real security, just go with a physical solution.

…until it isn’t: my ThinkPad P1 Gen 6 has the camera cover, yes - but it doesn’t have a cover for the depth-sensing camera, only the RGB cam, even though userland applications can get imaging data from that camera just as easily - which is potentially a bigger security issue: I imagine you could reconstruct my facial shape from the data and build a dummy head to get into my iPhone/iPad via FaceID.

(No, I’m not actually worried about this, I’m far too unimportant for anyone to make a targeted attack against)