This is not a manual process
Modern internet advertising is highly automated. When you start loading a page I the seconds that takes many things happen. The information held on you in cookies, browser configuration, location, device type etc. Are sent to the advert serving companies, these details identify you (by profile not name, user is etc.).
For example in this case being say an Australian male over 45 interested in aviation and investments who has regularly visited PPRuNe (and hence more likely to trust Dick Smith a long term high profile member.)
This profile is made available to the advertising buyers system. That system looks at the profile compares it with the type of profile they want to reach.
If there is a good match the buying system bids for the right to display its chosen advert. Other advertisers bid against them, the auction closes after a few hundred milliseconds and the winning advert is served.
PPRuNe will never see the advert, let alone have time to act to stop it appearing.
These need to be stopped at the advertising market or source.
As site users we can help by clicking the small report button embedded in the advert and possibly by sending Dick a PM with a screen shot and time stamp to provide evidence - although I doubt much more is needed.