I read both of your posts. No need to find further quotes. Slipspace isn't fractal on itself. It is only artificially fractal in very specific instances because of how the Forerunners manipulated it to suit their needs. IE, they shaped it into bubbles, or used it to create repeating patterns of infinite depth as your quotes indicate. Even then though, the artificially fractal nature of some of the Forerunners' slipspace technology is not explicitly stated to be why Halo's pulse can't enter slipspace. As I mentioned earlier, it's ambiguous to what effect - if at all - Halo has on raw slipspace.

Also what does it matter if they are artificial? It shows that Dyson's spheres used them.

Right, but Shield 0006 was only one layer deep, with further layers containing other rooms and facilities within. One layer deep was enough to protect Shield 0006 from Halo's pulse. So you can't come to a reliable or logical conclusion that protection from Halo's pulse is based on fractal depth. And as I previously mentioned, it's never explicitly stated anywhere in the lore that a slipspace bubble is why Shield 0006 (or any other installations using a similar method) were protected from Halo. It may well be that Halo's pulse can't penetrate slipspace in a meaningful way in general.