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 awesom

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.