Do you know his weight?
No, he didn't say. By default I take such claims for the average rider which is 75 kg. Of course it make much more sense when he tells he is 110 kg !
But then it's the low end that I am suspicious about ...
If you don't mind me participate to this thread, I would like to share my experience regarding swivels. I had the SS mickey mouse for about 2 years. Worked great in the begining, then less well, then from semi automatic it became totally manual. The problem is that it is too high to reach when riding, so I had to stop from time to time, pull the depower rope to catch the swivel, and untwist it. I don't know about Mutiny, but SS sells it for 99 USD !! So I got back to the old chicken loop with integrated swivel : it's a simple roller skate ball bearing I can change myself for less than 5 EUR.
I am not sure how the epic swivel works, but it's below the bar. So even if not automatic, it is very easy to untwist your lines while riding. North & BWS are doing the same. I think that's a much better option than SS, naish & mutiny, and you should probably stick to that.