Don’t be a chicken 
The command above will create the file /etc/modprobe.d/disable-ntfs3.conf
if it doesn’t work you can simply delete the file again with:
sudo rm /etc/modprobe.d/disable-ntfs3.conf
without doing any harm to your system…
The only thing to actually care for with such things is to make sure you do not make any typos and type in exactly what it says…