It appears that the days of PlayStation exclusives remaining as such are indeed long gone.
Traditionally, Sony Interactive Entertainment (SIE) pays little to no mind to other gaming platforms. However, in recent years, the company has seen a shift in focus. Perhaps due to the success of its initial PC ports such as Horizon Zero Dawn and Death Stranding, Sony is more open to bringing more of its exclusives to other platforms as well as opening up the PS4 and PS5 to cross-play.
Just within the past year, games like Days Gone and God of War have made their way to the PC with Uncharted: Legacy of Thieves Collection following suit.
In addition to this, SIE CEO, Jim Ryan, also reaffirmed PlayStation's commitment to bring "a whole slate" of games to the PC platform with the establishment of the PlayStation Studios PC label coming just a few months later.