The automated robot snake charger was originally introduced via teaser video in 2015. The goal was to achieve autonomous charging with no human intervention. Once Tesla achieves a truly autonomous vehicle, sans a driver or passengers, eventually the vehicle will have to be able to charge itself without a person manually plugging the charger into the EV.
A follow-up tweet confirmed that the robot snake charge concept is far from dead:
Musk did not specify any timeline as far as a plan or deployment for the robot snake charging solution. With Musk claims of a producing “1 million robotaxis” fleet by the end of the year, Tesla better get working. However, that timeline seems highly unlikely with just a few months left in 2020 along with the delay of the company’s Autopilot rewrite release.