You're cruel .. but I must admit that exploring the shortcomings of PCWorld staff is a favoured pass time of my own, something to do whilst the missus is shopping

The annoying thing is, she was probably told that in her 15 minute pre-sales class, because it's easier than fending off questions about "why" Linux doesn't currently need AV.
"It doesnt need AV can sometimes be a hard concept for Windows users to get their head around.
I suppose that in a weird way she's correct .. Linux/ChromeOS security layers themselves could be considered AV, just not in the sense she was pushing it
