From memory the reason they were nerfed before wasn't because the spells/miracles were considered as from a non-natural source, but that the people were... throwing them.
You would need to prove that the conjured weapons are thrown at MHS+ or SoL speeds. Which could never be done. Its why Elden Ring characters aren't
MHS+ for stuff
like this, since they just conjure the lightning into their hands and then do stuff with them. Also for the game the cloud to ground lightning attacks are treated as hitscan and are shown to act differently.