Does Windows std::thread uses internally PPL?

Is the implementation of Visual Studio 2015's std::thread internally based on PPL's task system?

The background of my question is, does it make sense to use std::thread for several tasks, because they are already executed balanced on the common threadpool, or is it better to execute the tasks via PPL tasks?

According to (Which std::async implementations use thread pools?) this seems to be, but since the question is rather old I would like to get an "official" answer.