I do not think you're talking even about the same games? This is about the _original_ X-Com.

Yep. It's this game:

https://www.gog.com/en/game/xcom_ufo_defense

Not this one:

https://store.steampowered.com/app/200510/XCOM_Enemy_Unknown...

There's a bit of confusion because the first game was called "UFO: Enemy Unknown" in the UK and "X-COM: UFO Defense" in the US [1] but the one discussed in the article is the 1994 game:

  X-COM: Enemy Unknown
  Developer: Mythos Games
  Publisher: MicroProse
  Format: Amiga, PC
  Release: 1994

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[1] https://en.wikipedia.org/wiki/UFO:_Enemy_Unknown

[2] https://dcnxazdl1qzggl.archive.ph/2Ue9d/b72fb5aeb68b363eebfc...