I don't know how you are reading the chart, but the chart clearly says that PDM5 works on 10.6 or later, unlike PDM6 which works on 10.6.3 or later (meaning it doesn't work on 10.6, 10.6.1 and 10.6.2).
The article referenced in that post doesn't exist anymore, the thread dates back to 2009, the information is outdated, you are probably running 10.6.8 which wasn't available in 2009 (10.6.8 v1.1 was released in July 25, 2011, SL was released in August 2009, the date from which this thread dates back, most likely PDM4 is compatible with 10.6 but not 10.6.3 and later).
Last edited: Jul 23, 2013