"But I gave you a link to an sferics site that has a stereo recording. It's obviously not a fake recording. Therefore it can be done"

Hah! As someone who worked in Theatre doing Sound and Light, that's easy to fake. And in Stereo, if you use a Stereo recording device. Even a blank tape, if played back loud enough gives you this effect. As well as mistuning an AM radio between stations. Been there, done that for fun decades ago.

Sferics depends on The Law of Fives (self delusion).