this is actually a really good idea to prevent one's face being recorded in public, at least if the few Youtube videos I've seen lately with a near-IR LED in them are any indication (and yes there have been a handful) ... it does still show up as visible light in recent instances I've seen.

https://media.mstdn.io/mstdn-media/media_attachments/files/112/005/313/889/068/202/original/0552da235fdf8bd4.png