The SalesLink document most certainly does reflect protection for AA-AA and AA-OW tickets ane makes no reference to same or separate PNR's.
The language is a bit poor because it still presupposes that the same policy exists for all of OW, but it does not. However, that poor wording does not affect the question of whether this policy affects AA-AA & AA-OW on separate tickets in separate PNR's.
The question of booking separate tickets into one PNR has to do with bag check only. AA will check bags across its own and OW tickets if booked into the same PNR.