As you can see from the link you provided and the answers below, the house is not on open market yet; whether it is with the listing agent on the link or the one below.
Most of the properties will come on open market because that is the best way to get most for the seller and very few sellers choose not to go with that kind of exposure.
As a buyer, your best option is to find a Realtor who is dedicated to you and to represent you as a buyer's agent so she/he can negotiate with the seller's agent to get the best deal for you.
If you are interested in more info about this or other properties, please give me a call (415) 717-0293 or email me at sylvia@SylviaBarryRE.com
I'm with Frank Howard Allen and have been since 1987.