The Patreon thing is interesting, but I'm not quite getting why the publisher needs to be on Patreon. The whole point of Patreon is that artists can get direct/crowd-funded patronage to produce work. The model fits for self-pubbing, I'd think. I guess if a publisher is promising to promote a specific type of work (e.g., diverse books) and there's an audience out there wants that access. But I'd be cautious because the usual Patreon pull in works by having a lower overhead for a single artist. If I'm running a publisher and need to keep the lights on, pay staff, pay advances, market, and so on, then I'm looking at needing a much bigger ask and/or a much bigger crowdfunding base. If the publisher isn't doing that stuff, that's a.) a red flag, and b.) the author is better off trying for an advance elsewhere or setting up her own Patreon. (ETA: Wrote this before digging into website. Patreon's getting more and more traction in the indie game community, because the model works really well for indie devs who basically self-publish to the App Store, Google Play, or any of the other varied and largely open markets out there. The model works less well with a conventional publisher. Kind of defeats the point. You wouldn't see a "AA" studio that has a deal with Sony asking for crowdfunding, though God knows some have tried.)
Ralphie, I hope you'll forgive my skepticism--it's what we do here; see rest of BR&BC for why--but if the book hasn't come out yet you're very likely still in the "honeymoon" phase. A good publisher sells books. A great editing and production process is nice to have, but it's sales that count.
Radiant Crown is apparently the publishing imprint of an indie game studio (Cherubim Scribles; same owner) that specializes in Ren'Py games. This is my area. There's some market in interactive fiction, but I wasn't aware it was large enough to finance a print publishing operation. Radiant Crown is POD for now, anyway, only pays a $100 advance, and pays royalties on net (though they define it). It doesn't look like they're going to move a lot of copies, frankly. That set up is very micro-publishing. Not necessarily a bad thing, on its own, but I still suspect you'd make more money on Patreon.
Looking at there website, there are a couple little cues that this is someone with a humanities degree, loads of passion, and no capital. The site calls it "fantasy literature" and uses "gothic horror" as a genre, both of which have a slightly academic bent compared to what you'd see in a bookstore, say. There are also more than a couple sentences that needed a proofreader, and good publishers should know one or two (or more).
To be kinda blunt... I love indie IF studios, but I've never seen one, even the larger ones like Choice of Games, that's set up to run a successful trade book operation. Some run small lit-mags and do decently. The IF market is largely online, it's small, and there's very low overhead. Its publishers also tend to not have the editing or marketing clout of even a small book publisher, ostensibly because it's a totally different industry with different audience expectations. Cherubim Scribes looks like most of these studios I know--it's a solo op, lots of collaboration on an adhoc level. This is a great way to make IF. It's a terrible way to run a publisher.
(Credit where due: according to the Cherubim Scribes' website they have a game coming out on the Nintendo Switch. So at least someone does. I'm glad to hear it, frankly, for Nintendo's sake.)