/usr/bin/PolyGUI2.7 is in polybori-gui 0.8.3-3+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../share/polybori/gui/PolyGUI2.7
/usr/bin/../share/polybori/gui/PolyGUI2.7