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If you beat a child every time he talked about having experience or claimed to be conscious he will stop talking about it - but he still has experience
There's a big presumption there. If he was a p-zombie to start with, he still has non-experience after the training. We still have no experience-o-meter, or even a unit of measure that would apply.
For children without major brain abnormalities or injuries, who CAN talk about it, it's a pretty good assumption that they have experiences. As you get more distant from your own structure, your assumptions about qualia should get more tentative.