My reading of the parent comment is that they understand everything you're saying, and their point is that the subject matter is thus a poor fit for the "Falseh

My reading of the parent comment is that they understand everything you're saying, and their point is that the subject matter is thus a poor fit for the "Falsehoods Programmers Believe" moniker. The phone number example they gave works very well for demonstrating misconceptions. Economics doesn't work as well for that, for precisely the reason you stated about it being partly sociological. In fact it's sociopolitical, which complicates matters further.