Poster didn't even talk about giving additional time, just faithfully fulfilling their end of the employment contract. It's bare minimum respect to your coworkers and clients/users to care about your work and make it as polished as you can.

A mentality of doing as little as possible makes life harder for the people around you as well. Twitter is low-stakes; no one will die due to some developer slacking off, but if you don't want to participate, then the least you can do is leave.