Well, Tiamut, you replaced the existing source with this, it is reasonable that it be tested.  As for Arafat, I imagined you were trying to write a comprehensive and neutral article, with all facts of interest to the reader.  And bunking with Arafat is at least as interesting as the chain smoking bit.  Regarding the book:
1.  The organization he belongs to published it with a publisher that is, at the least, affiliated with it.
2.  SELFPUB applies to organizations as well as individuals.
3.  It is the sole source for this quote.  Note the part in WP:SELFPUB where it talks about if a fact is truly significant, it would be included in another, more reliable source.
4.  Corrie is only peripherally the subject of the book, and many of the statements in there are opinionated and unsourced.  In fact, we don't even know what the source, footnote 26 is, it doesn't seem to be included in the Google Books version.  Do you have a hard copy?
5.  The quotation is at variance with the language quoted in the HRW report.  While HRW is not a RS either, it is a bit odd that there is this variance.  Do we even know what language the autopsy was in?  They might be saying the same thing.  After all, rocks falling on you is mechanical pressure.
We need to find a better source.