Shouldn't be. See the "exit 1" in your link? That's the end of the shell script, and as the OpenBSD link says;
> It remains possible to put arbitrary bytes AFTER the parts of the
shell script that get parsed & executed (like some Solaris patch files
do). But you can't put arbirary bytes in the middle,
> It remains possible to put arbitrary bytes AFTER the parts of the shell script that get parsed & executed (like some Solaris patch files do). But you can't put arbirary bytes in the middle,