Altiplano as Nik said, with GK training you don't earn more gaining or greens. Just saving time.
The reason they removed it, is that with the GK training you can break some "hidden" new limts. To stop mutants, the devs set some limits where it's very difficult to gain more .
Above 200 % ? Not sure.
But with the GK training, it's still working. You can see it i a video of Grubi about the new training, here in the forum.
Grubi also made a video about the pause-unpause trick.
lol