Is it a part of some DLC? How do I disable or remove it?

Do you mean the Metatron mystery?

Investigate timed anomalies (10 Metal or 1000-1500 Research each)
Survive the Ion Storm (unlocks Ion Storm Prediction technology)
Research the Ion Storm Prediction technology (predicts Ion Storms)
Survive the Ion Storms (unlocks Dream Reality technology)
Construct Project Morpheus within 20 Sols (random Wonder or Breakthrough technology)

https://survivingmars.paradoxwikis.com/Mystery

Thank you.

So apparently I need to start a new game and disable it in options to avoid this nonsense. No way to remove it from an existing game. Shame.