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> One could argue that this study is showcasing a strategy for people of a certain mindset to improve their willpower;

You mean the "certain mindset" specifically selected for by the people running the experiment?

There's nothing in there about the results being limited to "people of a certain mindset".

The article literally states:

the results highlight the critical role of beliefs about willpower in self-control performance

I don't know how generalizable the results are, and I'm not making claims about its generalizability. I'm simply refuting the notion that it's wholly incompatible with depletion theory. Speaking personally, I would have appreciated some notion of how common any belief whatsoever is for people.

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