Ghost of Tsushima is a title that Sony may want to port to PCs in the future then it's unclear when it could make the jump.
And just because some PS4 exclusives have made it over to PCs doesn't mean plenty of others will be doing the same.
So far there has only been a select number of exclusives that have landed on PCs, with many others only playable on the PS4.
This being said,there are a couple of alternatives for this game on PC like Sekiro:Shadows die twice, Assassin's Creed Odyssey and many more. Here is the link for more details on the alternatives:https://shrinke.me/X8G3hJ
If you have other sources saying otherwise make a comment and let me know.