That's actually working technique in sports psychology – one version of it called VSM (Video Self-Modelling), where edited video shows athlete performing correct/advanced technique. It tricks brain to belive in "future self". I'm not surprised it works with photos that well, but I think it's not studied yet. These AI photos I make a very different from, say, photoshopped faced. I tried it on myself too, and can confirm that it does have psychological effect.
Anything has an "psychological effect," and tricking a person into thinking any old junk is "better than therapy" is trivial - look at all the people who spend time and money on AI chatbots. It's also pretty clear it's not actually _good for them_.
And there's zero surprise here it would be used to manipulate potential athletes.
When I was in grade school I got the whole pitch on visualization: picture yourself making the free throw and you're more likely to make the free throw.