If it’s not you that have created the folder “devices” I think it’s deconz so yes it will be used.
And by deduction, from the documentation
Change the container mount point for your existing deCONZ volume from
/root/.local/share/dresden-elektronik/deCONZto/opt/deCONZ.
Its the persistent one, this one is not reseted by deconz.
Mean it can be a better way to use DDF than this method How to add/edit a DDF on Home assistant using text editor?