Your link to documentation showing OUTMODEL on page 1180 refers to PROC CALIS and not PROC PLS. So I don't see how it is relevant at all.
Your other link to the comp.soft-sys.sas archive seems to be referring to version SAS 6.11 which did have an outmodel option, again not relevant here, although it's good to see I was replying to this question back in 2006, and giving the same answer.
But all of this won't get us anywhere. The PROC PLS OUTMODEL option, if it exists, is currently undocumented, and so only people at SAS can tell you what it does and what it means, outsiders like me cannot possibly know what it does.
You don't need this mysterious OUTMODEL option anyway. If you want to save the results of your PLS model fit into SAS data sets, it can all be saved using ODS OUTPUT, which is what I do. All of the options available to save the results of PROC PLS via ODS OUTPUT are given here: http://documentation.sas.com/?cdcId=statcdc&cdcVersion=14.2&docsetId=statug&docsetTarget=statug_pls_details11.htm&locale=en
And here's the main benefit: if you use ODS OUTPUT, then everything is documented and explainable.
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