AFAIK fuseblk is how NTFS drives look in mount output. Hence the suggestion to use ntfs option in fstab:
/dev/sda2 /mnt/sg3t ntfs defaults 0 0
If you insist on your rc.local solution, you can try to prevent the system from fiddling with your mounts by uninstalling the udisks2 package. Obviously, don't expect the system to auto-mount anything after you do.
Alternatively, you can keep udisks2 and use it to mount your disk from rc.local:
udisksctl mount -b /dev/sda2