Came here to say this. If you put it close enough to your face and point the camera up a bit, no-one can tell your posture.

That said, I'm still waiting for the day when I can deep-fake myself on Zoom to have perfectly-combed hair, good posture, and a collared shirt like the boss requires even when I don't have perfectly-combed hair, good posture, and/or a collar. And even occasional blinks where the filter fails temporarily are a deal breaker. (Unless I can make the video just look like my internet is fucked and lagging rather than showing me with no filter. That'd be fine.)