Perhaps Dogme 95/Dogma 25 films are in a genre of their own, but they're not "genre movies." People make the same argument with "literary fiction"/"non-genre fiction" vs "genre fiction." The terms have meaning whether or not you want to acknowledge it.
Dogme is more of a methodology than genre. Genre usually means settings and tropes, like scifi or horror or superhero.
Though I’d argue that rom-com, period pieces, and biopics also are “genre”, at least to the extent a particular movie just paints by numbers within those styles.
I could see bangsian fantasy work if the afterlife were to be located on earth (which opens up some narrative possibilities, though they're a bit unoriginal). The other two are predicated upon portraying their locations inauthentically, which conflicts with the rules Dogme 25 strives to follow.
I'm thinking you could shoot an awesome sci-fi thriller under these rules. Even one that includes space travel. Just don't have any of the narrative take place in space: have only one character off-planet and have them communicate via radio.
I've seen good, low-budget indie sci-fi short films that would presumably meet all of the Dogma 25 rules. So I think it doesn't protect against this category of films and neither would that be a good thing anyways. It just requires creative solutions if you want to e.g. portrait space travel.
And it excludes a lot less than its inspiration Dogme 95, which has as one rule "Genre movies are not acceptable."