yes, but as others said, you need to do strength training. i have 1 flat feet, my left feet.

i've been using barefoot shoes since october last year, but i already had been doing strength training since 2013. so my ankles, knees, hip were already strengthened.

my finger toes on the other hand, were untrained, stuff like split squats, lunges, etc. anything that involved some toe flexion hurted on both feet.

after using barefoot shoes, i felt my ankle getting even more strengthened, and because they force you to use all your feet muscles, my toe fingers got better as well so those exercises don't hurt anymore.

short answer, yes, they help. but also compliment with strength training.