The house is not currently listed for sale. I understand the frustration when you find a property that has just been updated in the website and the information is old.
What Trulia and most other real estate website do is to gather information from many different sources. The basic idea is to capture as many listings as possible. Sometimes those other sources may have glitches and "update" an old listing. Trulia then get a new feed with that listing and thinks it is available.
I learned that the other day when a very old listing of mine became active again. After some research I found that the system I used to build the video tour for that house had a problem and re-published the video tour as a new tour. Trulia thought it was a new listing and re-listed the house.
Please note that this is not necessarily Trulia's fault. Trulia aggregates the information scattered in different places in order to facilitate the life of its users. They don't have control over what those sites publish.
I hope this helps.
Jose Dias, REALTOR