He doesn't access your data. He confiscates your phone, then still doesn't access your data, then denies you entry, then still doesn't access your data, then holds you in immigration detention for a week while he tries to access your data, which he can't. Is that a success? Maybe, if your data really is that valuable and a successful border crossing isn't.
> Maybe, if your data really is that valuable and a successful border crossing isn't.
Even if my data consisted entirely of cat pictures, it would be more valuable than successfuly crossing the border into a country that actively tries to invade my privacy.
To cross said border with my burner phone in my pocket and do whatever I need to do on the other side, why else? You do realise that is by far the most likely outcome, yes?