Nah, it’s different for everybody. Some people have stutters so bad that they can barely even speak. This guy has some fluency so it’s obviously a more mild stutter, but to say that this is his fault for not ‘trying hard enough’ isn’t fair. Stutters aren’t an exact science, we know very little about what causes them and, more importantly, how to help. With stuttering it’s never about a ‘cure’, it’s about trying to work with what you got. So while he should maybe try some relaxation or other techniques, this is certainly not his fault.