Jerry, that study has been bumped around for a long time...and there appears too be no substance behind it, beyond what the short page that describes the results says. There are no further references. Nonetheless, given how most people use the choke collars...it's most likely true.
I want to add that for me...again, for me...choke collars are a fine tool quite misused. I do not use a choke to give a dog a pop. I use a choke to give a dog a choke. It's a gentle, firm and smooth move. Typically it works like this: I lift the dog on the choke and say sit very nicely. When the dog sits, I release and praise.
It's comparable to an electrical stimulation, or a prong.
By the way, I don't use a prong to POP either.
Disclaimer: I don't use that method on puppies, nor do I use it to teach a command period. I use it as negative reinforcement...in conjunction with positive reinforcement and positive punishment.