I'm more into Gravity Rush than both Silent Hill and SIREN, so the idea of "horror themes but focused on entertainment rather than pure horror" sounds fantastic to me. While I'm not that into pure horror, I find the horror inspiration to be a godsend for good enemy design and variety. His description of what defines horror from his perspective also fits very nicely with my own preferences. Fuan no Tane is probably my single favorite horror thing ever.
Whatever it is, I'm definitely supporting them. I've been a little disappointed with Sony's first party output since pretty much Gravity Rush 2, so whenever one of the people responsible for making the games that made me care about their output in the first place branches off, I have to put my money where my mouth is. Just recently played Gravity Rush 2 for the first time, it was a very uneven game, with some of the worst chapters of both games by far. But it also had some incredibly high highs, and I definitely don't regret playing it, and it'll leave an impression on me for sure.