Oldexpat : "They need to be clear that they are talking about naked eye observation or electronic imagines." [SIC]
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There are better videos that show the designators atop the HUD that indicate the display being switched from "visual video" (white image) to "FLIR" (infrared -- black image). The targeting reticle object shows up strongly in both spectral domains.
Reports claim that these objects have been detected visually and on video, IR, and on RADAR. That encompasses a very wide spectral range.