Large companies like IBM value patents more than startups and have dedicated teams that help employees make tons of filings. I would bet this is part of why NY-NJ-PA, where IBM is headquartered, does better than you'd expect. And, Boston, which has no very large patent filers, does worse than you'd expect.
The 12% gain in "productivity" from moving maybe more to do with inventors joining companies that encourage them to file more patents than any real increase in their output.