I don't know, but I would think not. In the past, Rabin has been vocal about distancing himself from Yes, insisting that that period of his career was fun and challenging, but is definitely over. (Then last year, he finally got a chance to work with Anderson and Wakeman in AWR, which we now know is basically a Yes tribute band that happens to feature some significant former members of Yes, but it wasn't originally supposed to be that way.) My point is that I don't think he was worried about what hard core Yes fans thought of it over 20 years after leaving Yes.
It also depends upon your definition of "hard core Yes fans". I haunt the Yesfans boards as well as here, and when Jacaranda first came out, people weren't sure what to think, but everyone who actually picked it up and listened to it liked it a lot. I would consider some folks there to be hardcore fans, but hardcore fans can also be the most closed-minded. "If Jon Anderson didn't sing on it, it's not real Yes." "It wasn't really Yes until Howe and Wakeman joined." And so on.
I have my preferences when it comes to Yes, but I don't write off 80's Yes, and Trevor Rabin has done some killer movie soundtracks and is overall an excellent composer and musician. If he put out an instrumental album, I'm sure it's great. He wouldn't release it otherwise.
I haven't heard it, but my impression is that there just isn't an audience for such an album. Folks who like Rabin's 80's Yes aren't going to jump on an instrumental album he makes 30 years later. Neither are the ones who dig his movie soundtracks. Maybe a higher percentage of them, but there are fewer of them to start with. Who does that leave? The handful of people willing to take a chance on some new music from a guy they otherwise haven't heard much from in a long time. Thus the relatively poor sales, and Rabin left with the impression that no one likes it.