HD2 started as playstation exclusive, and was retargeted mid-development for simultaneous release.
So the PS5's SSD architecture was what developers were familiar with when they tried to figure out what changes would be needed to make the game work on PC.
I don't really understand your point. You're making a very definitive statement about how the PS5's SSD architecture is responsible for this issue - when the isssue is on a totally different platform, where they have _already_ attempted (poorly, granted) to handle the different architectures.
If what they were familiar with was a good SSD, then they didn't need to do anything. I don't see how anything Sony said about their SSD would have affected things.
Maybe you're saying the hearsay was Sony exaggerating how bad hard drives are? But they didn't really do that, and the devs would already have experience with hard drives.