I see what they're talking about. The difference is particularly noticable in Jefferson's hair.
The article states the series 2013 FA blockc contains the older design, but I have found only the newer hair in that block. This suggests a subset of FA has the older design. My Series 2013 F* note is of the older design, as the article states.
The first scan below shows the older design from a Series 2009 LA block, the second scan shows the newer design from a Series 2013 LA block. The red arrows point to areas on the newer design with noticeable differences in the hair.

