Not exactly.
When all grads match residencies that are 3+ years, then they all have a chance to get those credentials. Just because you get a 3yr residency doesn't mean you will finish it (quit, get fired, etc). You also have to factor in the people who do a 3yr surgical residency but just decide they don't like surgery (or have poor motor skill/talent and shouldn't do surgery) and never seek surgical certification. Also, ABPS written exam pass rate sure isn't 100%, and even assuming you pass the writtens, you have to compile enough cases and pass the oral exams (again, no piece of cake).
I'm not trying to dissuade anyone, but it's a long process that takes a lot of work. If you complete a good residency and apply yourself, then it's certainly within reach, but definitely not as if you are assured to become rearfoot & ankle surgery certified and FACFAS just because you matched a 3yr program.