Tl;dr lightings may be caused by electrons/positrons from outer space hitting a cloud and initiating an "avalanche" of electrons.
There hasn’t been an increase in background cosmic rays, so likely the mechanism for lightning generation is likely a continuum in different scenarios. Cosmic rays are one, but not all.
Despite the title, the video shows a really strong mesocyclone as there is a break between the cloud and the ground. The funnel might be visible, but it’s not as big as the video makes you think.
https://en.wikipedia.org/wiki/2025_Enderlin_tornado#Tornado_...