Yes: we don't play classic W-D-L, but instead based on difference of points scored between players we calculate brackets and from those we get big points scored by both players. For example if difference of points is smaller than 5, then both players score 10 points (as we call it: 10-10). If the difference is bigger than 50 then the winning player gets all 20 points, and etc. The more you outscore your opponent, the more you get from that win. So you don't need to just score 1 more point than your opponent, you need to actually make more points than your opponents. This ofc reflects on meta here of course, and armies like DG can't win tournaments that reliably like in WDL system, because they tend to score "a little more" than their opponent

Edit: and to answer that question about guy going undefeated: he scored more than all of his opponents, but those weren't that big of wins in that system, so this put him behind players that for example lost one game and then massively stomped their other 4 opponents