>They appear to think that the borrow checker isn't achieved with type theory, but with some other technique ("global analysis").
No, I think they appear to think that the borrow checker is not about the programmer stuffing the program with type theory annotations for this purpose, but the borrow checker handles the analysis automatically across the program.
Of course it doesn't handle it perfectly, so there's some "fighting the borrow checker" and lifetime annotations sometimes needed - but it's not like designing the whole of your program based on type theory - the same way you're somewhat free from thinking about freeing memory in a gc language.
No, I think they appear to think that the borrow checker is not about the programmer stuffing the program with type theory annotations for this purpose, but the borrow checker handles the analysis automatically across the program.
Of course it doesn't handle it perfectly, so there's some "fighting the borrow checker" and lifetime annotations sometimes needed - but it's not like designing the whole of your program based on type theory - the same way you're somewhat free from thinking about freeing memory in a gc language.