It's based on the new system consistently yielding lower unemployment numbers than the old system. When the new system consistently yields lower unemployment numbers than the old system, one doesn't really need to know why the new system consistently yields lower unemployment numbers than the old system to know that the new system consistently yields lower unemployment numbers than the old system.
This is not sound logic. If the old system were faulty this would be the case as well. If employment really were better and everything else stayed the same this would also be the case. Saying that lower reported unemployment is facial evidence of an attempt to change the numbers to make unemployment lower is illogical.
So again, you have made a statement that BLS has intentionally altered their calculations to make unemployment appear better. If this is the case, provide the changes they have made that accomplish this. If you can't do that you might want to question why you would come to such a conclusion considering your lack of evidence.
