Hello,
From what i read you do not have the /etc/xdg/autostart/polkit-kde-authentication-agent-1.desktop started because of this line in the desktop file:
OnlyShowIn=KDE;
I would not recommend to change that, but rather use the Qtile run commands …
http://docs.qtile.org/en/latest/manual/commands/shell/qtile-run.html
and initialize the polkit-kde-authentication-agent-1
I’m not familiar with Qtile at all, and how it works.