Strange, I looked that up and couldn't find it. I suppose I must have mistyped it.
OK, it's very confusing for me. The whole way of thinking about these statements seems to be different in Japanese than in English. Either that or だけ doesn't mean what I have always thought it meant.
In the sentence 鋼材が十分だったにも関わらず、工業生産高は5%(だけ)しか増加しなかった, output actually increased, not "didn't increase". It's just less than expected. It's close to an expression "didn't increase enough" in English, isn't it? (Output indeed increased, but it's not enough/it's less than expected.)
This is all logical to me, and these would be the common combinations in Engiish too.十分だったが、増加しなかった
十分だったので、増加した
不足していたが、増加した
不足していたので、増加しなかった