Way to flip the script on the real statement:
"Extraordinary claims require extraordinary evidence" - in other words, this speculation can be dismissed without additional proof
"Extraordinary claims require extraordinary evidence" - in other words, this speculation can be dismissed without additional proof
What Loeb is pointing at is that in the real world you can't expect extraordinary scientific evidence while refusing to fund the research that could produce such evidence.
I am not claiming that these observations are caused by aliens. I am merely pointing out the inherent contradiction behind statements like "we don't know what this is, but [we sure know] it is not aliens".