I don't know whether there's an idiomatic meaning of this sentence, but to me its verbatim meaning is 'It (the thing you've said) doesn't make it (the thing we're talking about) much clearer'.
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CliveHi guys,
I have a trouble with understanding the clause "that isn't saying much." Does it have the same meaning with "So it is obviously."
This expression is often used when giving faint praise.
eg After 20 years, he was promoted to senior clerk, although that isn't saying much.
The idea