I have been to the neighborhood several times, so let me try to clear up some things.
In all the times I've been there, I've seen one person walking in the SCA neighborhood. However, I've seen tons of folks walking, running, walking their dogs, biking, etc. in greater Anthem.
The SCA neighborhood where Steven's car was parked is fairly upscale and the landscaping (at least the majority) is all live, not artificial. Every, single home there is perfectly manicured. I don't know if the landscaping services are provided by the homeowners association, but I have never seen anyone outside doing their own yard work.
I have no idea what the statistics of luring a young man from another state on the premise of a job interview as a ruse for murder by a senior citizen may be but, personally, I assume the odds are pretty low.