Yeah they are very informed over at diesel car. I agree with that comment to a point (I assume you're referring to the summary at the bottom of the report). I think the main thing is that with the 130 being ?1,500 cheaper than the 150, it would indeed be the best all rounder for most people.
I think the other couple points of comparison were the engine noise and the extra turbo-lag on the 150. I love the sound of my 150's engine personally, not when it's starting up from cold though, but when it's warmed up and accelerating past traffic! I'm not going to comment on the turbo-lag cos I've never driven the 130, so i have no idea how different they are. Then there are many things they aren't compared on, such as road handling, which as I understand it is substantially better on the 150 due to the lowered suspension.
My view is that although the 130 is an excellent car and i would never say never to getting one, if, and it's a big if, money is not so much of an issue, and you have your heart set on a VW diesel, and you're not driving miss daisy which means the refinement difference doesn't bother you as much, then I cannot see why someone would choose the 130 over the 150.
Perhaps someone who has driven both could comment on the report??