The idea behind the fix is good, however the script keeps a copy of the "evil" Help Viewer Script called "OpnAppBACKUP.scpt".

A malicious web site could now target specifically this copy of the script and achieve the same results as before. Moreover, this copy could be left there even after an official fix by Apple, so your computer would still be vulnerably, albeit to a variant of the original attack.

Note to developers: remove the backup copy, it causes more harm than good.