I call BS.
It was never seen in TOS, so it's utter BS.
Yes, it was seen on screen in TOS.
Here's a nice close up of the E from Let That Be Your Last Battlefield, original effects
This should settle it.
Great thread title, by the way, even if not entirely accurate.
“A life is like a garden. Perfect moments can be had, but not preserved, except in memory. LLAP” — Leonard Nimoy (1931-2015)