I don't read this like that at all. It seems much more a reflection of exactly the difficulty you're describing: lots and lots of people like you want to find big suburban family homes but are priced out, and the suburbs are (awkwardly and somewhat unfairly) infilling to accomodate more modest and denser neighborhoods to house them.
The unfortunate truth is that "The Suburbs", as you and many people imagine, simply don't scale. So the actual neighborhoods we're building in the urban periphery are having to change. Recognizing that fact isn't "propaganda".