Ending up with a code base which is 10% of the size of the original is a massive improvement, can you share some examples of what the code was doing before? Even cutting down by 50% would be impressive.
Not to discount the value added in this case, but remember that the report is possibly biased in the same way that many "We rewrote it and now its 10x as awesome as it was before!" reports are. Rewrites almost always tend to result in higher quality code, regardless of what the rewrite is to or from.
