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While not technically a demo scene demo, in 1952 Sandy Douglas pushed the EDSAC to play a game of noughts and crosses (OXO) on its cathode ray tubes.

https://en.wikipedia.org/wiki/OXO_(video_game)

The DemoScene has existed forever... well before computers, lathes, etc... all the way back to "Look at the way these pictures come to life and dance around when the torch flickers inside this cave"

The "scene", no, but demos? Arguably, yes. The demo scene was little but the evolution of demonstrations of tech or art from doing it as e.g. part of a product demonstration or research to doing it as art or for reputation.

E.g. the IBM 7094 "singing" Daisy Bell in 1961

https://www.youtube.com/watch?v=41U78QP8nBk

The name doesn't necessarily need to be the date it was created on.

We had oscilloscopes in the 60's. It could have.

In a ''For All Mankind'' sorta way, I suppose.

Don Lancaster talks about "quadrature art" in his Active Filter Cookbook from 1975 — so it was a thing by then.

https://www.radiolocman.com/shem/schematics.html?di=151800

Also, in the scene events they often have ANSI art competitions on the program but even before colors and computers people were using typewriters to make character based artwork. So in a sense, the ANSI art art form predates computers. Somewhat.