This is very true. the method for calculating the national unemployment rate is much more forgiving in that it excludes people who are not actively looking for employment. Much of the improvement in the national employment rate hasn't necessarily been due to an increase rate of new job creation but a decrease in the work force due to people not actively looking for jobs.
Edit: It looks like the ABA uses the same type of calculation (unemp/seeking), as long as they define the workforce the same the calculations should be comparable.
most schools crop out people they define as "unemployed-not seeking," but it's unclear where those numbers are in the ABA data, so perhaps it is a bit lower.