Hi, the style format appears to be very similar to Yamaha’s, but no guitar mode setting, that I could see. So think as Ted said, possibly ssf1.
Couldn’t find anything on xg sounds, but there was mention of gm2, yamaha styles use xg, so even if it loads them , probably wouldn’t play them with correct drums .
(The manual isn’t as detailed as korg and Yamaha that mentions every single drum sound etc, ) so , hard to tell.
Good part is it looks like you can event list edit factory styles onboard, which isn’t always the case with Yamaha styles even when they’ve been unlocked with third party software. (Some you have to do in a Daw )
The Medeli editing page reminds me of how Yamaha styles are set out , when I used to load them as .mids for converting to Korg. Maj . style tracks channels 9 to 16.
Min. 1 to 8.
Does have the ability to create styles by mixing tracks from style to another.
Couldn’t find anything on being able to edit style in a Daw.

As Diki said they’re going to have to find some way of getting more third party styles.