I don't think that's right, Flecc. The Tidal force motors/batteries were larger in diameter and all black/grey. His bike is just a DIY with two of these cheap Chinese 1500w motors that are all over Ebay. You can see that he has two batteries. There's a stack of lipos behind his seat and a massive one under all that gaffa tape.
Golden Motorstill make/sell a double-motored bike. I had a go at fixing one for a guy, which had had water in the integrated controllers and motors. I got it going, and it was pretty quick. The standard battery is miles too small, but the owner had got himself a massive LiFePO4 once to replace it. The weight wasn't too bad when riding, and it felt a bit like a bicycle and that you were contributing something by pedalling, but I think that was just an illusion: