This Magnetic looks very similar to something Castrol was selling back in the early 2000's. I called up the lady in Jersey and she told me they used esters in the additives only but the base oil was fully mineral/conventional oil. Maybe they dropped that oil, after a spec upgrade.
Looking at the MSDS on the Castrol Web sight, the Magnetic contains different kinds of highly refined base oils than the Edge North American. There must be some quality difference but that's strange that they don't market the Edge as having good polar attraction to metal if it indeed has it. They used to market molecular protection in the Syntec line, but not now in the Edge black bottle.
I'd like my oil to have good polar attraction, and Group III's do that sort of thing. As to the GTX Magnetic? I'd be interested to see how it holds up in a uoa, tbn retention, iron contamination levels, volatility testing, though it does claim to meet SN standards.