This could be bullshit, but seems the Reddit mod says there was some verifiable info from the source, though it's not necessarily airtight... but for what it's worth...
Konami and Kojima are in talk about Silent Hill, as we speak.https://www.reddit.com/r/silenthill/com ... lent_hill/So far the word about one of KojiPro's long time directors leaving is still a rumor that's not verified, and Mr. Imaizumi has still been tweeting positive things about Death Stranding.
Kojima has in interviews and on twitter post-Death Stranding been talking about the possibility of working on a horror game and is aware that fans are interested in that from him, and while he has confirmed Kojima Productions is at work on their next project he has not confirmed the genre of the game, so his recent words relating to horror games are so far only hypothetical.
While Death Stranding has done very well in Japan and been well received, it is hardly something that would make Konami take any notice to change their stance.
While Konami is likely willing to licence out the 'Silent Hill' IP to third party developers as they've always done, at little to no risk to themselves, it'd highly doubtful that they'd go to Kojima or that Kojima would go to them. Though, if Kojima was willing to shoulder the risk of development costs himself, then it's really a win-win situation for Konami business-wise.
It's possible that Kojima still wants to do a horror game, but is worried about whether Konami will try and claim he's using creative ideas he conceived while working for them (creatives in companies usually have clauses in their contracts where the company they work for owns all their creative ideas, or must approve of any other creative works someone does outside their company that may risk competing with their own service/product), so Kojima would likely have to talk to Konami about making a potential horror game even without their IP, and maybe it would be simpler to just contractually make a Silent Hill game for Konami as the publisher.
If I had to guess, we'll know soon enough as PS5 is on the horizon and it's likely Sony will have Kojima using Decima to make a real-time tech demo, which Kojima could use as a conceptual teaser for his next title.