"Digital [adj]: (of a clock or watch) showing the time by means of displayed digits rather than hands or a pointer."

  A digital clock is a type of clock that displays the time
  digitally (i.e. in numerals or other symbols), as opposed 
  to an analog clock, where the time is indicated by the 
  positions of rotating hands.

https://en.wikipedia.org/wiki/Digital_clock

I think scoreboards would be considered digital displays even if they use lights to make the numbers.

Digital. Digit-al. It displays the time in terms of digits.

Does it display digits?

FWIW, It's not just the AtlasObscura writer. NASA calls it analog on the page referenced: "Workers remove the analog countdown clock from its mount..."