With a quick browse, it seems more like people who had their funds frozen by Paypal without any reasons or way to rectify the problem. You can become a Claim Class Member if you had your money frozen from April 2009 to Nov 2015 (I think). If so you can claim from 3 to 440 dollars which is the basic claim. Did not bother reading the claim further up.
Seems like it only affects people who've had their money stolen or in paypals term "frozen". I doubt it will change their charge back method at all actually. Sounds more like paypal scamming than anything else.