That's more than five years beyond the May 2014 end of support for the OS.
Not for Embedded XP.
Support for the last release of XP Embedded runs out in January 2019.
That's Windows Embedded Standard 2009.
They may have until April 2019 if they're using Windows Embedded POSReady 2009, so a couple more months. Of course they may also be using bog standard XP Professional which was indeed buried years ago...