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 shap

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].