It could possibly be true, although let me give you the other side.
I know a 16 year old brooklyn boy who is not in yeshiva this zman (in fact, not since elul zman), askanim were and still are working diligently to open doors for him, and have gotten him a farher in at least 3 different yeshivos. Yet, he is still not in yeshiva. This boy doesn’t want to be in yeshiva. Once his parents came to that realization, they worked with the appropriate people and arranged for someone to learn with him 90 minutes every morning. They hired a tutor to prepare him so that he can take and pass the test to earn his GED and he works locally for 4-5 hours a day.
It is not always the fault of the yeshiva that someone is not enrolled in yeshiva. Perhaps this relative of yours is going through the motions of taking farhers to make his parents happy, but is sabotaging himself purposely at the same time so that he wont be accepted.