It's not a back door, it's an abuse of an existing approach.
Google could weight the process in one of two ways:
1. in favour of the complaint-maker.
2. in favour of the website-owner.
If they favour the complainant, then website deletion is presumed to go ahead. If the webmaster, then it is presumed to be held up.
Google chose a compromise: the complaint is acted on, after a delay. The webmaster gets notified through webmaster tools; after some period of time the removal goes ahead.
If Google flip the compromise around, they will make it nigh impossible to remove any websites from the index.
I think you're misunderstanding the article. Google webmaster tools allows the website owner to request links to their own sites be removed. The poster has discovered that this form can be used to request any url be removed, and Google will think it's being submitted by the owner of that URL.
This has nothing to do with users complaining about a URL.
Google could weight the process in one of two ways:
If they favour the complainant, then website deletion is presumed to go ahead. If the webmaster, then it is presumed to be held up.Google chose a compromise: the complaint is acted on, after a delay. The webmaster gets notified through webmaster tools; after some period of time the removal goes ahead.
If Google flip the compromise around, they will make it nigh impossible to remove any websites from the index.