It means that the patch has been replaced by a newer one, and that the newer one should be used.
If you notice 2 lines at the top of the document like:
The recommended patch is : PHCO_35998
The most recent patch is : PHCO_35998
This mean that the most recent patch with this same functionality is PHCO_35998. It also means that HP recommends that you use PHCO_35998 rather than the old patch.
Info on PHCO_35998 here:
http://www11.itrc.hp.com/service/patch/patchDetail.do?BC=main|search|patchDetail{PHCO_32438,{hpux:11.11,}}|&patchid=PHCO_35998&sel={hpux:11.11,}