What you are probably seeing is that the lis pendens (aka foreclosure notice) has been filed. The foreclosure process has been started, but that can take months to work its way through the system. If you took the client's name and went to the official records website from your county, you would likely see the lender has filed lis pendens.
That being said, your original questions: yes, most likely still live there and aren't paying their mortgage anymore. And of course you could contact them, it will depend on how much they owe vs how much the property is worth. You tend to think if the house is worth more than they owe they would just sell and pay off the bank, but you never know. It could be hardship, loss of job, death, etc.
You might want to look at some comps and get an idea of what you think the property could be worth, and then you can reach out to the owner. You will need to figure out what they owe so you know what you are working with. And of course the condition of the property comes into account as well. It could be a wholesale deal, something you buy and rehab, something you do a subject to (essentially paying them to take on their existing mortgage terms if you think you can rent for more than their PITI payment is), or other structures.
Long story short yes you can contact them and see what their intentions/needs are.
Hope that helps.