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I agree, no matter how much cement you force in there your not going to "fix" the problem. You need to remove that rotted wood, replace it with treated lumber, add a large drip edge over the wood, down the side and then over the top of the wall, then build new run off parges.
If you don't remove the rotted wood and try to cover it up you will be in for much greater hurt down the track.
What you have was never a great idea, but I've seen it done on many homes with a similar design with almost always the same problem you are facing.
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