You are right, it is a flawed number, it does not take into account "the discouraged(people who gave up looking for work)", "the startup(ie most of YC)", prison

You are right, it is a flawed number, it does not take into account "the discouraged(people who gave up looking for work)", "the startup(ie most of YC)", prisoners(1.5% of theworking population in US) and some other groups. However, 10.2% unemployment even by flawed definition is still significant.