Epson is never mentioned in the linked blog post, it says those are HP ink cartridges.
Also according to original story those are only from 2010 and 2012 + another model added for comparison: HP 350/2010 (left), HP 350/2012 (center), HP 301/2012 (right).
Original non-blogspam article in English: http://www.hpinkcartridges.co.uk/technology-blog/2012/05/hp-...