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Not sure if you're being deliberately dense but he means a thick cloud. A very cloudy day where the clouds are very dense and voluminous.

If sounds like you don't agree with him, but don't pretend you don't understand him. Please.

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You're going to need to show me charts with strength of signal being diminished by "proper" clouds before I'll even remotely come to thinking this isn't just FUD. So, no, I don't understand him, and yes, if this is the premise I do not agree with it.

It is pretty simple, you can't see through a cloud because the visible light gets scattered. This system works with 1550 nm light, which behaves pretty much the same in the context.

Normal ground to satellite communication use wavelengths of 7 mm and up, as those have reasonable cloud penetration.

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