No, it's a really bad idea to keep them with the gold fish. If your tank is that big, why not get a tank divider and just separate them. If you have just one Axolotl, all he really needs is about 10 gallons of room.
Axolotls have a difficult time defending them selves against goldfish and larger predators. Axolotls getting bitten by other animals, i.e goldfish or Axolotls, or any other animal can lead to infection or fungus problems. Axolotls really aren't able to defend themselves from Axolotls. They can swim or nip back, but the goldfish will always find a way to snack on the axolotl. Which ever site you got that information from wasn't very informative.
The little Axolotl that I got from the petstore recently got so sick from the goldfish that he was with. Sometimes I wonder if he will live into the next month. He never moves around. His gills were nearly all nipped off and he's alone in a quarantine tank. Even if your goldfish are healthy, they can still cause health risks to your little buddy.
I have a 60 gallon tank that will soon be ready to set up and will cycle it for a good 30 days and test it before I put my Axies in it. If the new guys lives and I can get rid of all the parasites he will move into the tank with them once I know he is healthy.
I think your best option would be to get a tank divider. They sell these at most petstores, or if you live in the united states or Canada, you can order one from this site:
www.bigalslonline.com
Also,
www.axolotls.org this site holds loads of information, especially the forum about Axolotls.