They didn't mention martingales. Martingales tighten the same exact way a prong does, but they are not correction collars so they do not give the effect of power steering. However, if you teach your dog to walk with a loose leash, then you do not need to be pulling, yanking, or correcting them.
I use a flat collar for the tags.
What they said about the choke chain is not correct. The idea is not to let the dog pull until it chokes itself. That is ridiculous and uninformed. The choke chain is a correction collar like the prong collar. It should remain loose around the dog's neck. When the dog reaches beyond where it should be, a correction is given and the pressure is immediately released. Usually the sound of the chain is enough for the dog to know it is not where it ought to be.
Unfortunately, the choke chain has been used poorly and ineffectively by millions of people because they are cheap and readily available. People put them on backwards so that they do not release tension, they yank and crank away, they let the dog pull, pull, pull, they have even hung dogs up by them until the dogs are unconscious. It is not a tool I feel comfortable suggesting because of how easy it can be abused, however, it can be safe and effective.
Typical, use the most extreme, rare, examples you can, to fear monger a tool....let's not worry about the PERSON that would do this...but the tool being misused....
The chiro that wrote the article could have made it an article that says, "train your dog to walk on a loose lead, otherwise he will be out of alignment." Instead he picks the collar that causes the least trouble because it self-corrects, and the dog there fore isn't pulling the owner using its neck. However, depending on the use of the prong, you can still do more damage with a prong collar through corrective pops, than you will if you train the dog without the used of these types of corrections.
I am not a fan of prong collars. I am not purely positive reinforcement either. But I do not like using leash corrections on dogs specifically because a dog that is corrected will generally need stronger and stronger corrections to avoid behaviors that are of more value to him, which means stronger leash pops, prong collar or no, and that means it is likely that you will cause damage to the dog's alignment. There are better methods out there to train dogs.
Yeah....we know...and stop acting like because you have a couple prong collars "laying around somewhere" (gosh, you've said that so many times)...that you can now speak all-knowing about them. I could go buy a tractor and drive it around my yard and then let it gather dust in the garage, doesn't mean I know anything about growing and farming corn.
If you repeat his little study and check out dogs that have been trained to walk with a loose leash, then I am sure you will have less issues with those dogs overall, than any of the collars for dogs not trained.
It is just a feel-good article for people who use prongs, when places are banning them.