If you watch the videos in the article interviewing crew members, they express great doube that these were sensor anomalies. They mention replacing equipment, doing several re-calibrations, and that the detections were multi-spectral and even corroborated on separate craft and sensor packages.

I'm a former military avionics dude who worked on systems like this, including "black" stuff. I don't believe in extraterrestrials having visited Earth.

Their explanations sound pretty on-target and baffling.

But anyway, they address the concerns you bring up rather well.