I've heard from people NT received disturbing comments on twitter and other places, but i think there is a clear difference between something being sent to a particular person or group (to their home or place of work).
When you receive something like "I will beat you up" and its sent to you, then its serious.
But if your sent a letter saying "Fk Dmc i hope your company bombs!", then thats...just someone who doesnt like you.
But to my understanding the death threats that Tameem spoke of, sounded more like anti reboot material. Even in the comment Tameem said "We received death threats in form of ANTI-dmc metal songs".
I mean how can a anti-something be a death threat?
He prolly received this song: