You're ASS-U-Me-ing they were under NODs, a fact not presently in evidence.
You don't fly into a brightly-lit aerodrome wearing NODs. And you don't fly around with your anti-collision lights on under NODs for the same reason (and the 'copters ac lights were visible in the video). It's not about stealth, it's about impeding the operation of the NODs.
FWIW, FOV in NODs (except the 4-tube gizmos the Snake eaters use) typically is about 45°, whereas normal human FOV is about 180°x120°. And best-case visual acuity when wearing them is about 20-30.
I never flew in urban areas with NVGs in use. Cultural lighting washes out EVERYTHING.
And NOD is...?