This blog post is written by Sergio Demian Lerner who has found a number of minor security vulnerabilities in bitcoin's source code.
His method of associating blocks to Satoshi's identity has been disputed by several developers of bitcoin.
The 2 persons who are disputing Sergio's findings (gmaxwell and DeathAndTaxes) are the minority. I personally agree with Sergio, I understand his analysis technique, and I have read his previous supporting arguments.
gmaxwell was for example making incorrect claims, saying you would need 50+ computers to mine at ~5 Mhash/s (average hashrate throughout 2009) because CPU and code at the time was not optimized. I proved gmaxwell wrong by benchmarking an early version of Bitcoin and showing a 5-year old $200 4-core Phenom was able to do 5 Mhash/s. This validates Sergio's theory that Satoshi could have very well represented the majority of the mining hashrate with a single computer throughout 2009.
Gregory Maxwell is listed as a developer. He also has contributed a lot of code to the project.