My AS child has low average WM scores (WMI 86 on the WISC). He also has wicked long term memory (147 for story recall delayed on the WJ-III, IIRC and tons of those anecdotes where he remembers details I, who also have a very, very long memory, plain forgot).

1) These (working memory and long term memory) are two completely different things. Working memory is really the processor's internal buffers and is not even that related to short term memory.

2) I haven't read the article yet but my sample of 1 argues that there is not a 1:1 relationship between WM and ASD.