The Guardian's 'expert' doesn't know what he's talking about, IMO. Windows has security holes that have been there for years, in some cases, decades, that Microsoft doesn't see fit to fix, not to mention the dozens of security fixes released every month fixing flaws that 'could allow an attacker to gain control of your system' and it doesn't seem to hurt people's confidence in that product. At least with open source the problems get found and get fixed, usually fairly promptly.
The BBC's technology reporter is another one that often seems to have a very poor grasp of the subject he's reporting on.