When I went he didn't even go as far as that - just said that not getting selected doesn't mean you cannot be a professional pilot. Perhaps the more assessments they do, the more they believe in it
I think this sort of testing is fool-proof in so far as if you
haven't got the appropriate aptitudes then there's no way that you can ever do well in them. The flaw is that, conversely, you can easily mess up and perform less than brilliantly even if you
do actually have the right skills - of course, I still feel that makes the tests fair as a competitive way to whittle down the short-list, but I don't believe you can make many cast-iron assumptions out of the results.