I'm not entirely sure. SkiaSharp is the driver behind all the 2D graphics, isn't it? But the SkiaSharp repo is effectively unmaintained except maybe to support critical things for MAUI.
SkiaSharp has some MAUI integration, but AFAIK it's not used to render things. At least not when I last looked. On most (all?) platforms native drawing methods are used (which fits well into how MAUI works on each platform, admittedly). This comes with the drawback that performance varies wildly across platforms, however. (NB: I've last looked deeply into MAUI about a year ago, so things may have changed.)