We get this question alot here in Trulia's public forum. You can probably get a better answer from Trulia by using the "help" link in the top right corner of a Trulia window to ask you question directly to Trulia instead of using this public question and answer forum.
From what I know the link you submitted is not an actual listing for sale of the property but rather a post of public information that Trulia has pulled from a previous public listing, tax records or some other public source.
If you or another Trulia affiliated Broker were to list this home the new listing information that you submit should override the existing information and also allow you to log in to the listing on Trulia and change data details, description and photos.
Hope that helps.