A slingshot as a sentry elimination/assassination weapon?

#ChinaStory This guy is very skillful with his slingshot just like heroes described in legends. His accuracy is incredible! pic.twitter.com/mTzwzGgPtw

— China Daily (@ChinaDaily) August 30, 2020

Interesting.  I imagine it would take a helluva lot of practice but would it be possible to get to a point where a slingshot used with steel pellets could be used for sentry elimination or assassination?

From this video it does seem possible.  Additionally from the Bible (and using it as a recorder of history) it would seem that shepards actually used them to defend against predators and thieves.

Could it have application in modern warfare by unique units?