Look, lets just dispense with all the drama and speculation and look at things from an objective, business standpoint.
Say what you like about Konami, but they are a well-run business from a stake-holder standpoint. They backed off from AAA game-dev and their profits went up. The reason why they've let their legacy franchises slide is pretty obvious: they couldn't figure out a way to monetize them sufficiently.
Silent Hill is not a franchise that lends itself to mtx and GaaS monetization. Metal Gear does but Kojima's acrimonious departure and the dismal failure of Survive to do anything critically or sales-wise pretty much demanded a re-think.
If you think about it, Sony offering to cut them a deal structured similarly to what they offered Kojima is a win-win for both parties. Sony funds, gets console exclusivity and leaves them the option to also offer it on PC after a time. Konami gets a refresh to its franchises with minimal risk, Sony gets two fan favourite legacy properties back on its platform -properties that fit very neatly with their present line-up- and if these prove profitable ventures there's a solid partnership going forwards to revisit other back-catalog IP like Castlevania.
Why wouldn't such a deal be unable be able to be worked out? Especially as Sony have already shown a willingness to do the exact same sort of deal with Kojima and I think very significantly with SE over Final Fantasy.