Statistics can prove anything you want them to.
In my opinion, OAA's statistics mearly indicate which airlines recruited their graduates and in what numbers. To try to prove anything else with them is impossible and quite frankly of no use, as they are historical statistics the minute they are released. Nobody knows how many low hour (i.e straight out of training) and experienced pilots are currently unemployed.
If an OAA graduate took 3 years to find employment, then informed OAA that they had found a job, they would appear on the statistics for the year in which they found a job, thus further invalidating the data for statistical purposes.