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I have to wonder if there's some aspect about the night vision optics that results in points of light looking like triangles.

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Good call, it’s most likely bokeh.

See https://youtu.be/g256IPFoqMg

Mick West incidentally does a number of quite good videos on UFO footage and camera phenomena.

Yep the bokeh takes the shape of the aperture blades. Typically they look like hexagons but I could see in this case of some weird military night vision it being triangles.

Here's an example of a lens with a triangle shaped aperture: https://vintagelensesforvideo.tumblr.com/post/126045282053/t...

I'm pretty sure that is the case here. I have a vague recollection of video footage from the '90s of a similar diamond-shaped UFO being explained away as a shape made by the optics of the video camera distorting a bright, not-quite-focused light [possibly Venus].

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