Those skis are true WC construction, but they arent the exact skis that the athletes are skiing on this season - maybe last season or the season before - trust me on this one. They are a race stock ski, no doubt, but they arent what the athletes are skiing on this season (if you ordered this seasons race stock from atomic you are skiing on a mix of the most popular shapes and flexes from last season). The same goes for other companies as well. Often there are different flexes that are produced, but the skis that go to the WC skiers are much different in terms of flex from the skis that go to your average masters or USSA racer.
I know companies do this for a fact because i know skiers who get WC Stock skis because of long time family connections with the industry, and because of their own racing ability. They are much stiffer, get slightly more rebound, and like to go FAST - faster than the regular race stock boards (not flexed retail skis - real sandwich race stock skis). Just to provide a good example - look at the race stock skis at your local Elan dealer. They are no doubt different from the retail ski, and they ski totally different. Then look at the skis the Chip Knight skis on... not the same skis. He has next years skis, or even the following years equipement, that will be released to the general racing public as race stock skis next season or the season after.
Look back at Salomon LAB skis as well. I have a 2003 GS ski that was a race stock in 2003, but if you find someone from the WC that is selling their skis, it is the same ski from the 2001 season that they were racing on the WC. The 182cm GS ski was the GS ski that was used by the women at the olympics (won i think), but it could not be bought under the Salomon Race Stock program until fall of 2002, which was when i got mine. If you look at the shape of this ski, you will notice that for the 2003 model retail GS ski, they introduced a very similar shape and flex pattern to normal consumers. Watch any ski company, there is a delay of about 1 to 2 years from when a deisgn is used on the WC to when it is used in race stock skis for the public, and another year before it finally makes it to consumer gear in one form or another.
The world cup is used a testing ground for race skis. They find out what works and what is fast, then find a way to build it so it will last for a whole season and then make it available to USSA racers. This season Elan actually missed the boat on topsheet epoxy, and most of the skis that were produced early in the summer/fall lost their topsheets after a few runs. Mid-season they changed this so they actually stayed on. Anyhow lets venture back to the original question, which was regarding consumer skis... which most of us ski on every day.
OBTW, i have a pair of Elan SLX WC skis that were skied by a girl on the Slovenian ski team in the 2000 - 2001 season. Their shape is 108-62-90 in a 155. They ski almost identicle to my 2003 Elan SLX T which has adopted a bigger tail than the 2001 model (109-63-98 @ 155). The ski was unchanged for consumer racers for the 2004 season. All of the above mentioned skis are totally different from the retail ski which is 107-63-94 at a 154. Ironically enough my team mate has the 2002 model SLX T in a 162. This ski has a similar shape to the 2003 160cm ski, but has a smaller tail - more like the 2001 ski. It appears that on the WC in the 2001 - 2002 season is when the very wide tails came into existence, but it wasnt until late 2002 and 2003 that these shapes were available to consumers.