In Peak, Ericsson seems to finally settle on one definition, which was what I used in the end. He calls what you just describe "not being able to deliberately practice like a grandmaster" a completely different thing — purposeful practice.

There's a whole chapter in Peak where he tries to talk about what to do if you are in a field with badly developed pedagogical methods. It's basically a badly written copy of The Power of Intuition (Klein). I was incredibly dissatisfied with it, because I was mostly interested in putting DP to practice, and his recommendations were far from practicable. I wish he had just referred to Hoffman or Klein, both of them practitioners in NDM, and therefore both more familiar with attempts to design training programs for fields where no pedagogical rigour exist.

I know you're inclined to give Ericsson a pass, and pass things off as deliberate practice even when his definition clearly excludes said thing. But my view is that we should call a spade a spade and use the exact definitions the man used. If he thought it was good enough for his popular audience, it should be good enough for me.