This sounds a lot like what Krav Maga claims about its teachings. They certainly have a point when they say that fighting in the ring and fighting against gangs with guns and knives on the street is a very different situation that traditional martial arts do not do much about.
Unfortunately, from what I understand, Krav Maga students don't practice against resisting opponents. Because of this, it has been criticized as more of a "dance" art, where the student and the opponent are just going through a "kata" or predefined motions without meeting real resistance.
Of course, it is rare to come across a situation in any martial art where your training opponent will be resisting 100%, the way a real opponent would on the street.
However, there are some martial arts where opponents do give a significant amount of resistance both during training and in competition. I have heard the claim made that this factor makes the students of these other arts more ready for real survival situations than something like Krav Maga.
Krav Maga - Is not a 'dance' martial art. You will learn the quickest way to ensure your opponent is on the floor and will not be able to getting up again easily.
You will train against resisting opponents. You will train against multiple resisting opponents simultaneously. Then you will train against opponents with plastic knives and guns.
You are taught things like 'If your opponent is on the floor - keep kicking him - because then you look like a psycho and nobody wants to fight a psycho'.
Brazilian Jiu-Jitsu, Judo, Muay Thai, boxing, various types of wrestling, and many other arts train and compete against resisting, sometimes strongly resisting, opponents.
It's interesting, Krav Maga makes similar accusations about "regulated" sports like the ones you mentioned. Its argument is that on the streets you're not both following the same rules on the fighting ring, you're using guns, knives, pencils, baseball bats and kicks to the groin, almost always facing multiple opponents at the same time. There's nothing in the sports you listed that prepares you against that.
That said, I agree that simulating twisting the weapon out of someone with a gun pointed at your forehead with a fully extended arm might lead to a boost in confidence, but not so much of a boost in survival rates. I'd still argue that your chances are better with techniques fine-tuned for the streets, rather than the ring.
