The article isn't clear as to whether this includes both passenger cars as well Volvo's trucks and buses. The V40/50 Bi-Fuel, S60/80 Bi-Fuel and V70 Bi-Fuel are some models that at one point or another were available in natural gas form. Hopefully, we'll see additional reports soon to clarify some of the gaps. I wasn't able to find the Goteborgs-Posten article, though, I did try running this page through an online translator, but it was still illegible so I'm not sure if it's the actual source report. A few searches on my usual news feeds found no one else reporting on the matter. This page on Volvo's website shows that the S60 and V70 are still available in Bi-Fuel versions in Europe.
Monsters and Critics also points out that since 1995 the Swedish car manufacturer has only sold about 10,000 natural gas and biogas vehicles.
[Source: Monsters and Critics]