The picture, which comes from the set of Luke Cage Season 2, shows Misty Knight alongside Luke Cage with a metal arm connected by a wire going into her actual arm. The arm definitely looks cutting edge, but not so much so that it doesn’t look like anything that could not exist in today’s world.
The image comes from EW, and was shared by Misty actress Simone Missick.
One thing fans of the comics might complain about is the arm is not the trademark goldish/bronze color the character is typically known to have, although a hint of that color can be seen just near the tip of where the mechanized prosthetic ends.