I hope you didn't spend too much time in dev tools digging through their many .js files and scattered code looking for the function where they set their cookies or whatever they do to allow subscriber access.
news-shield.com's paywall is primitive enough to be susceptible to simply disabling javascript and you get the full article, with css (give em credit for no js required css implementation (although that's prolly bootstrap doing that), even if they need to update their code-base to use webpack and maybe move off of jQuery)
Since the Barron News-Shield has other articles related to this case on their site:
there's a convenient chrome extension which allows you to toggle javascript on/off for a particular site, without impacting javascript in your overall browsing experience. many newspaper paywalls can be circumvented with this extension by disabling javascript (NYTimes and Wash Post used to be, not sure if they still are).
Disable JavaScript
Add to chrome, browse to the news-shield.com site and then click the green toggle switch on the upper right-hand side of the browser and it turns red, indicating javascript will be blocked when you reload the page. Reload the page and you'll have full access to the article and every article on the site. To turn javascript back on for that or any site, simply click it again to turn it back to green.
Google "chrome extension disable javascript" and it's the 2nd result, 4.6 rating. But any chrome or other browser disable javascript extension should work just as well.