Okay, posting to help others as I did find the solution to this. As the error message states, the binary has to be suid root. You can get it going by typing:
sudo chmod 4755 bin/chrome-sandbox
From wherever you installed M5Burner. This, and adding the current user to the dialout group, should really be part of the installation instructions. I can't see how anyone on Linux would avoid doing both of these steps.
Now I if I can figure out why the Tab5 is bootlooping i'll be up and running...