I found the article pretty poor in general. It equates use of lower isolation levels with use of NoSQL, despite the fact that RC still provides dramatically higher guarantees than a typical NoSQL DB - particularly when you add in the ability to use foreign keys.

Further, it counts 'well understood and quantifiable' consistency flaws as a negative, where in fact the whole point is that you can trade off isolation for performance in ways that are easy to mitigate for certain applications. By contrast, the consistency tradeoffs you make when using a NoSQL DBs are clearly rather poorly understood by the community at large.