So, what we know is that 60% of the employers are top performance - this means that 40% are not.
Also, half of the employers (50%) are in the rigorous training program.
Consider this situation: all of the employers in the in the rigorous training program are top performers ( and some top performers are not) - this is a possible situation (then the statement would be correct)
On the other hand, another possible situation is that all of the non-top performers are in the rigorous training program - and some of the top performers are too. (then the statement would be incorrect)