Does EVO test the cars themselves?

Just curious as they have the VXR down as 6.7secs which is the same as they have for the Coupe Turbo .. yet the Astra GSI is 6.0 secs ...

Whats the deal with EVO tests?

Heres the webpages

VXR, Coupe Turbo & 888

Astra GSI Turbo