It is capable of damaging and killing immune enemies.

Here is just an example of the damage against immune enemies:
https://youtu.be/6JV4G4NHrSg


Meanwhile, here is a video when my guild tried to kill Razorback with this bug. The result is exactly what anyone would expect.
https://youtu.be/j5CFzJ4JAWY


Since Massive does not say WHY we should avoid using it, I feel like the devs are not aware that the ND fix causes those issues.