You're more likely to get this infection from eating raw oysters or getting poked by a spine on a ray, etc. than by wet wading anywhere here in PA.
Like most of these types of infections, they're rare and you're more likely to get it if you're already immunocompromised in some way. If that's the case, then you can just as likely get it in an open hangnail when you put your fish back in the water, etc. In the case of Vibrio vulnificus, the bacterium responsible for the infections in the article, you're more susceptible if you have some form of liver disease like cirrhosis, etc.
There is definitely some risk associated with wet wading, but the inside of your waders is also a nasty environment and not without its own risks.
Jeff