This is a crazy example because everything is done with upselling. So at the end you get a 100% overall quality player with 340% white skills. Can't be done with normal training, a gap of 240% between overall quality and white skills.
And remember you always get similar opponents there.
Like I said, it's not that it doesn't matter anymore. But A it's harder or impossible to train mutants without doing stuff like upselling and B they nerfed the impact of the white skills at least a bit and C the random factor got higher as well. So putting all of this into context, of course training is not as effective as it was before.