I am skeptical of everything.
Inspect entire data path.
Where are the detectors located?
How are they configured?
Buried antenna wires?
HF receivers with low-pass filter?
Amplifier?
How is the data digitized?
What website(s) receive data directly from one or more detector sites?
What algorithm receives the data and turns it into graphs on a website?
You see? Inspect every stage of the process with curiosity and accept nothing at face value.
Correlate with other data sources if any are available.
Curious autism coming from an engineering/radio background.