How is this seller getting so much traffic / sales

did you try selling for lower? or try to sell at the same price as he dose and yes he could be using a different site that redirects them to his main ebay account

What I ask myself is, how could OP sell for same price or even lower than this seller? Where does he get the product from? If he buys from magnumxl_wholesale, then if he resells at the same price as he is buying, where is the profit?! There is even a big loss, because you have to consider ebay and pp fees that he also will have to pay

Also a good way for driving traffic to eBay listings is using Google Shopping .....

yes, it's low competition , almost none
people will buy to him , for sure..

but how does he get so much positive feedback, I do not think that his product will really work ....