The “soul” term is marketing BS like the soul patch mustang logo Ford decided to sticker on to the chin of its EV.
If you ever see one, look at the front. It’s totally got a soul patch. Eww.
As far as engine noise or rumble and that wonderful visceral feeling of the pistons and crankshaft throwing their weight around, I would agree there is something utterly cool about that. As there is of the clip-clop of a cantering horse as well. But again, calling it “soul” is just clever deceptive words that marketing came up with.
If any car has soul, it’s one where the founder poured his passion for years, nearly went bankrupt, persevered, redefined the limits, led a workforce that did the effort of a lifetime to help make the company survive and push out its most successful product that continues to be unmatched, all driven by a mission... now THAT is a story of soul.
The gas car companies want to claim the word for themselves though, just because they have a nice rumble and some fire and smoke, but more because they realize they are in trouble. Fire and smoke are romantic, no doubt, but you can’t replace that with a soul patch.