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I don't get how near IR is able to distort facial recognition software.

Let's say I have a camera that cannot record in IR range, just the full spectrum. I can still run a facial recognition software using those photos.

I am well and truly lost about how it works

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Almost all image sensors see near IR very well. Most consumer lens block IR very well, to make image similar to that perceived by human. Not so for CCTV lens: they don't block IR to allow human-invisible lighting via LEDs just like in these glasses.

Which implies that this wouldn't do anything to diminish facial-recognition from consumer devices (e.g., facebook auto tagging, Google Glass, etc.)?

Try filming an IR remote control (while pressing a button) with your phone's camera. It'll light up. I think it's pretty cool actually :) (might need to do it in a dark room, depending)

I suppose the GP was talking about actual non-phone photo cameras?

Most cameras record IR.

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