The source is a translation of the original article in another language.
Again the source is not reliable. It's a rumor at best.
Here 's a better translation
GT5 was naturally present at the Sony’s press conference and more informations about how things will happen in game are now released. The game will feature a “web-browser”, whereby you’ll be able to purchase online parts. Think off engines, exhausts, rims, etc... The reference and the price you’ll pay for these will correspond to the ones you’d buy in real world. Of course, you’ll use in game credit to purchase these.
With this, you’ll be able to tune you car too your personal taste. This sure was available in previous iterations, but with the fifth one it is brought to a higher level. Also, a specific Home space, running at GT5 level, will be created. This space will work two way. As soon as you purchase some items in Home, these will be available in game. This works the other way around, if you purchase a car in game for example. What is to understand with this is still unclear, but will become by itself later on.
I highly doubt they will sell a custom spoiler for $300 real money. It's easy to tell that it will be in game credit.
It said web broswer, it didn't say like a real web browser or an in game web browsing simulation.
