Well that was an unexpected twist.
Dammit Physics!
I decided to put some regular black electrical tape over the camera to block it whilst keeping a neat finish. Turns out IR passes straight through electrical tape 😂
I did consider whether its because of the adjacent backlight and so I tried blocking that too, however most of the rooms I sit in have enough ambient IR to not matter.
I'm considering something more "glass like" since that seems to reflect IR much better but the seems a pain.
Anyone else have a better solution they've found?
Its probably at the point for me that its "good to know but can't be bothered" but there's just so many interesting and unexpected outcomes I felt compelled to satisfy my curiosity and share.